I don't have any favorite XXX games. For me, they're just a stress reliever after work, nothing more. It's just that I send some games to the trash right away, others I save until the end of the gameplay, focusing on my subjective assessments of the gameplay and the plot. I'm not into collecting these games.
Such a Sharp Pain (SSP) and Everything Gets Boring Eventually (EGBE). Unfortunately the author (Ketzal) had his accounts nuked, so the future of these games are in doubt.
1. Such a sharp pain (rip original vision)
2. Imperial Chronicles
3. Once in a Life Time
4. Amity Park (Super slow updates - near abandoned)
6. Boxed in
7. My new memories (Super slow updates)
8. Measuring my Cum (RIP)
9. Returning to Mia
10. Haley's Story
11. Parental Love
12. God Life (Super slow updates)
13. Tales from the Unending Void
14. Summer Scent (Super slow updates)
15. How I became the Bodyguard of the Saintess.
Currently greatly enjoying Radiant for the story pacing, though I'm only on Chapter 1/2. Cute girls, has father daughter stuff.
Others I really liked before would be My Dorm, Such a Sharp Pain, Parental Love, Eternum, My New Family, My New Memories, Bad Memories, Mist, and some of the Citadel series games as weird as the writing can get weird in some of em.