The one game with mega boobs that I like is Twisted world. Great model work and animation, so they manage to not look absolutely atrocious like in most games.
Renpy produces 3 filetypes - .rpy, .rpyc, and .rpa.
.rpy are raw source files, effectively .txt files for all intents and purposes, you can edit them with any text processor.
.rpyc are compiled sources. There's decompilers both online and for download that will turn them back into .rpy.
The...
I have my filters everywhere set to exclude them, so I don't even remember they exist most of the time.
If someone were to film porn with the game in mind, there might be some value to it. But using clips of pre-existing stuff just seems reduntant at best. Might as well just watch the original.
The whole discussion where the line between monster girls and furries is has been around for as long as I can remember. Personally I'm in the camp that it's the facial structure that determines that. If it has a snout, it's a furry.
Ren'Py is basically Python with some accessories aimed at building VNs. Python itself is among the simplest languages to get into since it's very human-readable and handles basically all the low level plumbing for you.
Bilateral being an even split between the human and monster halves - i.e. mermaids, centaurs, lamias, etc. - and extremal being mostly human torso with monster bits on the extremities - i.e. catgirls, kitsune, succubi, and the like.
I pity whoever tries to mod that thing. yandev's work is a masterclass in how you don't write code and he's made it abundantly and explicitly clear he does not intend on improving.
Windows, hands down. Gaming on Linux is a meme and the less is said about Mac, the better.
For mobile obvoiusly Android, in iOS it's an absolute pain in the ass to do anything in the files system at all from what I've heard.