2 Years of Service
- Allow others to update?
- yes
- Developer Name
- Ruykiru
- Developer Links
- Version
- Chapter 3.5
- Latest Update
- Mar 4, 2026
- Release Date
- Feb 15, 2024
- Language
- English
- OS
- Windows
- Linux
- MacOS
- Android
Overview:
Embark on an unforgettable journey with Erik and Lyna, two young twins entangled in a passionate web of desires. Set against the breathtaking backdrop of a private tropical island villa, their reunion after a year abroad sparks a fiery exploration of emotions that defy traditional boundaries.
As they tread the line between repressed feelings and mutual attraction, their bond deepens and the craving for the forbidden becomes impossible to ignore. With the arrival of their mother Helga on the horizon, will they succumb to temptation or resist the call of their primal urges? Discover the twists and turns of this compelling narrative through a kinetic visual novel where love, family, and desire intertwine in very interesting ways...
DISCLAIMER: Read the dev notes before spreading hate please. This is NOT your usual incest visual novel about a mindless poorly-written harem. It has a big focus on the taboo itself and making the family relationships actually matter and mean something more than just a label. Expect very heavy incestuous dialogue here, without any silly censorship patches.
3dcg, animated, big ass, big tits, small tits, corruption, femdom, female protagonist, groping, handjob, incest, lesbian, male protagonist, masturbation, milf, multiple protagonist, oral sex, romance, sleep sex, teasing, twins, vaginal sex, virgin, voyeurism, triple-H (handholding +hugging + headpatting 
)
Planned Tags:
footjob, titfuck, vaginal sex, anal sex, drugs, pregnancy,
)Planned Tags:
footjob, titfuck, vaginal sex, anal sex, drugs, pregnancy,
1. - Extract and run.
(15/Feb/2025)
Chapter 3.5
- Story continued: +614 new renders, +16 animations
- H-Scenes: +1 mom-son-daughter (extremely long!)
- General improvements:
-> Nothing of note. But as a sneak peak, I'll mention that update 3.6 will be a very long and awaited lesbian scene, update 3.7 will have a big story event and a really special mom-son moment, and 3.8 will be the climax of the chapter.
(29/Nov/2025)
Chapter 3.4
- Story continued: +640 new renders, +55 animations (total of 7 minutes of animated scenes!)
- H-Scenes: +1 mom-son-daughter (long), +1 mom-daughter (very long!), +2 bro-sis
- General improvements:
-> Upgraded Helga and Erik character models
-> Fixed gallery unlock button logic: becomes "unlock all" whenever you're missing at least one (in new updates for example)
-> Optimized code (most saves broke, sorry! use the chapter select)
-> Remade options menu; much better clarity.
(23/Sep/2025)
Chapter 3.3
- Story continued: +363 new renders, +27 animations, +5 songs
- H-Scenes: +1 mom-son (very long!), +1 bro-sis
- General improvements:
Chapter 3.2
- Story continued: +460 new renders, +7 spicy animations, +9 songs
- H-Scenes: +1 mom-daughter (main focus, very long!), +1 mom-son-dau
- General improvements:
Changelog for 3.1:
- Story continued: +400 new renders, +14 spicy animations, +7 songs
- H-Scenes: +1 mom-son (main focus, very long!), +1 bro-sis
- General improvements:
Chapter 2.7
- Conclusion of Chapter 2.
- Story continued: +858 new renders, +40 spicy animations, +9 songs including 1 new music video with custom lyrics
- H-Scenes: +3 bro-sis (one is long awaited one!), +3 mom-daughter, +1 mom-son-dau. (Don't worry, mom-son will get plenty in Chapter 3)
- Enhanced the flow of the story in chapter 1 and up to chapter 2.6:
(16/November/2024)
Chapter 2.6
- Story continued: +574 new renders, +11 songs
- H-Scenes: +1 bro-sis (very long!), +1 for mom-son, +1 mom-daughter, +1 mom-son-dau
- Removed +100 lines from the narrator during many scenes of early chapter 1. Replaced with either nothing, or new thoughts/dialogues. Reason: "show, don't tell" (Expect more tweaks/reworks for chapter 1 in the future, because I was still a noob back then, sorry :3)
(11/October/2024)
Chapter 2.5
- Story continued: +820 new renders, +9 animations, +6 songs
- H-Scenes: +1 for mom-son, +1 mom-daughter, +1 bro-sis, +1 mom-son-dau, +big time skip (with lots of teasing!)
- Added a chapter selection option after clicking 'Start' in the menu. In case you got issues with saves or need a fast skip.
- Added the 'Jukebox' to the main menu to listen to all the tracks from the game.
- Added the changelog tab to the menu, with all the version change notes.
- Improved the official Android version with swipe gestures and a better interface.
- Scene replay gallery has an infinite scrollbar now instead of numbered pages, and it is sorted by version.
- Rewrote the chapter 2.3 phone conversation with Lyna's friend (much shorter and Lyna doesn't fully reveal the forbidden relationship with Erik).
(16/August/2024)
Chapter 2.4
- Day 12 & 13 of the story: +573 new renders, +7 animations, +7 songs
- H-Scenes: +2 for mom-son, +1 mom-daughter, +2 bro-sis.
- Added a "fantasize" button that appears sometimes for bonus renders. Only for some NEW scenes from now on.
- Made text outlines a bit thicker for improved readability.
(12/July/2024)
Chapter 2.3
- Day 9->12 of the story: +487 new renders, +9 animations, +11 songs, +more sex sfx.
- Remade ~100 renders from day 1-3 with chapter 2 quality (might do more in the future).
- Text format changes + colors for character dialogue and thoughts.
- Reduced file size for all versions (normal, android, superHD).
- Tweaked early chapter 1 to have less verbose narrations and a bit more focus on character thoughts.
- Removed the option to rename the characters. This is a multi-protagonist story, there's not one single MC.
(5/June/2024)
Chapter 2.2
- Day 8 of the story: +557 new renders, +9 animations, +18 songs.
(5/May/2024)
Chapter 2.1
- Helga (the mom) is here! Chapter 2 begins.
- Day 7 of the story: +312 new renders, +8 animations, +9 songs.
(12/April/2024)
Chapter 1.5
- Conclusion for Chapter 1.
- Day 6 of the story (and a bit of 5 & 7): +347 new renders, +6 animations, +8 songs made exclusively for the game, +1 music 'video' with custom lyrics.
- Added a different phone conversation interface depending on the character.
- Lyna received some nipple surgery (redid some renders too)
- Fixed some text display issues in the Android version.
(29/March/2024)
Chapter 1.4
- Day 5 of the story: +333 new renders, +6 animations, +13 songs.
- Remastered around 30 intro renders and 10 Helga renders for character consistency.
- Added phone interface for future conversations that use phones. I went back and used it for the first pool conversation with Helga that wasn't showed before.
- Remade main menu.
- Made Android version (tell me if you find issues).
(15/March/2024)
Chapter 1.3
- Day 4 of the story: +274 new renders, +5 animations, +11 songs.
- Added replay gallery for both story scenes and H-Scenes.
- Added auto-forward button and the respective setting.
(1/March/2024)
Chapter 1.2
- Day 3 of the story: +150 new renders, +11 animations, +5 songs.
- Remastered all +220 renders from 1.1, big improvement in quality.
- Expanded the final sunset scene from chapter 1.1.
(16/Feb/2024)
Chapter 1.1
- Initial Release
Chapter 3.5
- Story continued: +614 new renders, +16 animations
- H-Scenes: +1 mom-son-daughter (extremely long!)
- General improvements:
-> Nothing of note. But as a sneak peak, I'll mention that update 3.6 will be a very long and awaited lesbian scene, update 3.7 will have a big story event and a really special mom-son moment, and 3.8 will be the climax of the chapter.
(29/Nov/2025)
Chapter 3.4
- Story continued: +640 new renders, +55 animations (total of 7 minutes of animated scenes!)
- H-Scenes: +1 mom-son-daughter (long), +1 mom-daughter (very long!), +2 bro-sis
- General improvements:
-> Upgraded Helga and Erik character models
-> Fixed gallery unlock button logic: becomes "unlock all" whenever you're missing at least one (in new updates for example)
-> Optimized code (most saves broke, sorry! use the chapter select)
-> Remade options menu; much better clarity.
(23/Sep/2025)
Chapter 3.3
- Story continued: +363 new renders, +27 animations, +5 songs
- H-Scenes: +1 mom-son (very long!), +1 bro-sis
- General improvements:
- Added "Unlock All" button to the scene gallery.
- Updated Helga's skin textures for the body, face and nipples. She looks more MILFy now
- Improved character lighting for the new scenes, Sinful Summer has never looked better!
- Changed rendering method for the new animations, they are true 60fps now!
- Replaced itch.io link in the main menu with f95zone link after my account was deleted. Fuck censorship!
Chapter 3.2
- Story continued: +460 new renders, +7 spicy animations, +9 songs
- H-Scenes: +1 mom-daughter (main focus, very long!), +1 mom-son-dau
- General improvements:
- Added the transitions skip setting to the options.
- Changed the dialogue font to be more readable.
- Fixed display issues for the gallery in all versions.
- Reworked use of italics and quotes.
- Erik is no longer British (he doesn't say "Mum" anymore lol)
Changelog for 3.1:
- Story continued: +400 new renders, +14 spicy animations, +7 songs
- H-Scenes: +1 mom-son (main focus, very long!), +1 bro-sis
- General improvements:
- Added the accessibility settings menu to the options.
Chapter 2.7
- Conclusion of Chapter 2.
- Story continued: +858 new renders, +40 spicy animations, +9 songs including 1 new music video with custom lyrics
- H-Scenes: +3 bro-sis (one is long awaited one!), +3 mom-daughter, +1 mom-son-dau. (Don't worry, mom-son will get plenty in Chapter 3)
- Enhanced the flow of the story in chapter 1 and up to chapter 2.6:
- Total narrator lines went down drastically 1100 -> ~550! Some were very unnecessary with the visuals on screen, and I'm only keeping most now to enhance the erotic scenes.
- More focus on thoughts and new dialogues. For example, Erik is the one introducing the family now.
- Reduced the length of some monologues and made some dialogues a bit more natural/casual.
- Remade 140 renders and 2 animations for day 1-2 of the story.
- Completely remastered 35 music tracks from the original soundtrack, including the ones with custom vocals.
- Normalized all sounds to try to reduce the ones that were too loud or quiet. Stick to my recommended audio range and adjust your device as needed.
- Optimized file size and format for all versions (normal, android, superHD). Version 2.7 has better quality than 2.6 but similar size!
(16/November/2024)
Chapter 2.6
- Story continued: +574 new renders, +11 songs
- H-Scenes: +1 bro-sis (very long!), +1 for mom-son, +1 mom-daughter, +1 mom-son-dau
- Removed +100 lines from the narrator during many scenes of early chapter 1. Replaced with either nothing, or new thoughts/dialogues. Reason: "show, don't tell" (Expect more tweaks/reworks for chapter 1 in the future, because I was still a noob back then, sorry :3)
(11/October/2024)
Chapter 2.5
- Story continued: +820 new renders, +9 animations, +6 songs
- H-Scenes: +1 for mom-son, +1 mom-daughter, +1 bro-sis, +1 mom-son-dau, +big time skip (with lots of teasing!)
- Added a chapter selection option after clicking 'Start' in the menu. In case you got issues with saves or need a fast skip.
- Added the 'Jukebox' to the main menu to listen to all the tracks from the game.
- Added the changelog tab to the menu, with all the version change notes.
- Improved the official Android version with swipe gestures and a better interface.
- Scene replay gallery has an infinite scrollbar now instead of numbered pages, and it is sorted by version.
- Rewrote the chapter 2.3 phone conversation with Lyna's friend (much shorter and Lyna doesn't fully reveal the forbidden relationship with Erik).
(16/August/2024)
Chapter 2.4
- Day 12 & 13 of the story: +573 new renders, +7 animations, +7 songs
- H-Scenes: +2 for mom-son, +1 mom-daughter, +2 bro-sis.
- Added a "fantasize" button that appears sometimes for bonus renders. Only for some NEW scenes from now on.
- Made text outlines a bit thicker for improved readability.
(12/July/2024)
Chapter 2.3
- Day 9->12 of the story: +487 new renders, +9 animations, +11 songs, +more sex sfx.
- Remade ~100 renders from day 1-3 with chapter 2 quality (might do more in the future).
- Text format changes + colors for character dialogue and thoughts.
- Reduced file size for all versions (normal, android, superHD).
- Tweaked early chapter 1 to have less verbose narrations and a bit more focus on character thoughts.
- Removed the option to rename the characters. This is a multi-protagonist story, there's not one single MC.
(5/June/2024)
Chapter 2.2
- Day 8 of the story: +557 new renders, +9 animations, +18 songs.
(5/May/2024)
Chapter 2.1
- Helga (the mom) is here! Chapter 2 begins.
- Day 7 of the story: +312 new renders, +8 animations, +9 songs.
(12/April/2024)
Chapter 1.5
- Conclusion for Chapter 1.
- Day 6 of the story (and a bit of 5 & 7): +347 new renders, +6 animations, +8 songs made exclusively for the game, +1 music 'video' with custom lyrics.
- Added a different phone conversation interface depending on the character.
- Lyna received some nipple surgery (redid some renders too)
- Fixed some text display issues in the Android version.
(29/March/2024)
Chapter 1.4
- Day 5 of the story: +333 new renders, +6 animations, +13 songs.
- Remastered around 30 intro renders and 10 Helga renders for character consistency.
- Added phone interface for future conversations that use phones. I went back and used it for the first pool conversation with Helga that wasn't showed before.
- Remade main menu.
- Made Android version (tell me if you find issues).
(15/March/2024)
Chapter 1.3
- Day 4 of the story: +274 new renders, +5 animations, +11 songs.
- Added replay gallery for both story scenes and H-Scenes.
- Added auto-forward button and the respective setting.
(1/March/2024)
Chapter 1.2
- Day 3 of the story: +150 new renders, +11 animations, +5 songs.
- Remastered all +220 renders from 1.1, big improvement in quality.
- Expanded the final sunset scene from chapter 1.1.
(16/Feb/2024)
Chapter 1.1
- Initial Release
IMPORTANT: After the nsfw itch.io ban wave, f95zone is officially become the place where I will personally host the free version of Sinful Summer. There will never be anti-piracy systems in my products. I still trust in the early access model, so I hope my paid subscribers have some human decency. I'll never put any anti-piracy DRM systems in my content. More information here KN - Ren'Py - [HS2] - Sinful Summer: A Tale of Forbidden Love [Ch. 3.4] [Ruykiru]
ABOUT HATERS: This is not a harem power fantasy, please kindly leave the thread if you are just here to complain about that. You are always welcomed to simply ignore the game if it's not your cup of tea. I'm trying to create something different and engaging were family relationships actually play a part and are not there just as labels. There's nothing I hate more than censorship and the step relatives nonsense. This is the real deal.
ABOUT MULTI-PROTAGONIST: Erik is NOT the MC, all three characters are the protagonists (Lyna, Erik, Helga), so it's not my fault if you struggle to understand the son in particular because you decided to identify as him. The game has many dialogues and internal thoughts from a POV perspective, but it's also a kinetic novel so there's no choices and the omniscient narrator is prevalent throughout the story. The son is and will be the only male involved, the mother is divorced, and the 3 main characters (MFF family) are the only participants for future tags. There won't be any other men. (So there isn't NTR, don't ask).
ABOUT LESBIAN: There will be lesbian scenes in chapter 2 onwards between mother and daughter only where the son is not directly involved. I don't think that as cheating or whatever you want to call it because, again, both Lyna and Erik are the protagonists of my story. However, if you disagree and don't like that stuff, then I politely invite you to just ignore the game and don't complain in the thread when those scenes are eventually added.
ABOUT HAREM: There won't be any side chicks, nor aunt, grandma or cousins. This is a family trio and adding more love interests would just reduce the amount of time I can use to develop each character.
ABOUT FEEDBACK: This is my first project so constructive, non-hateful, criticism is greatly appreciated. If you are just here to complain then I suggest you give a read to the compelling analysis and reviews that many posters have made about the game already, clearly showing that this is not the usual incest visual novel, so don't come expecting the brainless tropes repeated ad nauseam.
ABOUT HATERS: This is not a harem power fantasy, please kindly leave the thread if you are just here to complain about that. You are always welcomed to simply ignore the game if it's not your cup of tea. I'm trying to create something different and engaging were family relationships actually play a part and are not there just as labels. There's nothing I hate more than censorship and the step relatives nonsense. This is the real deal.
ABOUT MULTI-PROTAGONIST: Erik is NOT the MC, all three characters are the protagonists (Lyna, Erik, Helga), so it's not my fault if you struggle to understand the son in particular because you decided to identify as him. The game has many dialogues and internal thoughts from a POV perspective, but it's also a kinetic novel so there's no choices and the omniscient narrator is prevalent throughout the story. The son is and will be the only male involved, the mother is divorced, and the 3 main characters (MFF family) are the only participants for future tags. There won't be any other men. (So there isn't NTR, don't ask).
ABOUT LESBIAN: There will be lesbian scenes in chapter 2 onwards between mother and daughter only where the son is not directly involved. I don't think that as cheating or whatever you want to call it because, again, both Lyna and Erik are the protagonists of my story. However, if you disagree and don't like that stuff, then I politely invite you to just ignore the game and don't complain in the thread when those scenes are eventually added.
ABOUT HAREM: There won't be any side chicks, nor aunt, grandma or cousins. This is a family trio and adding more love interests would just reduce the amount of time I can use to develop each character.
ABOUT FEEDBACK: This is my first project so constructive, non-hateful, criticism is greatly appreciated. If you are just here to complain then I suggest you give a read to the compelling analysis and reviews that many posters have made about the game already, clearly showing that this is not the usual incest visual novel, so don't come expecting the brainless tropes repeated ad nauseam.
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