wow, ty! i'm glad you enjoyed the game, and thanks for the big comment! it's always nice to her people's thoughts on my game stuff.
yeah, when i wrote this game i really wanted something that was much more... lateral in its progression, rather than having content gated behind, like, mechanical puzzles. i've definitely had more than enough of rpg-lite sex battle systems, or w/e. i've actually thought a lot about the process of balancing porn with mechanics for porn games, since for future projects i'd like to have some mechanics, but like you say it's really difficult to balance just because game mechanics generally aren't, y'know, fun to interact with if you're looking for a bunch of porn. at the same time, i do think some more gradual pacing could help there be more of a buildup for the actual sex. but it's a difficult thing to work out.
pc-focused prostate milking scenes are a good idea -- i don't think there's any in the game, but that's something i'll keep in mind for later versions when i try to flesh out the sex scenes list even more. ultimately, a lot of tfs don't have as much impact in the game as i'd like, just because of the enormous amount of writing filling out all the different permutations takes. i'm glad you enjoyed what was there, though! (actually originally there was a mutation, 'wide hips', that determined whether you could actually take some of the biggest dicks, but then i never ended up writing all the various branches in the various sex scenes that would've used it, since it turns out taking a huge dick is generally more interesting than not taking a huge dick. :V 1.1 adds a single scene that changes slightly if you have it, but that's still it.)
also yeah, i'm just now finishing up the final new scene for the 1.1 version! so expect that after not much longer, & hopefully you enjoy all the new scenes.
with ophion -- there was some code that was supposed to slowly regenerate his lightrot supply over time, but it was bugged and only triggered the first time you visited him, instead of every time. so in the current version, you'd have to manually bring him lightrot crystals to get more injection scenes, i think (and the option for that doesn't even show up unless you already have some on you, so it's difficult to even tell that that's an option available). anyway i fixed the bug, and made his dialog options reflect some of that, so it should be way clearer in the soon-upcoming 1.1 release. also i fixed the issue with djen, too.