If you haven’t, give the following a play:

• The Company - Sissy path is kinda hidden but it has some nice writing. It can be triggered by being submissive and triggering a random event twice before attempting to dose a certain character with serum.
• Friends of Mine - Very promising game with a lot of polish. Still very much a WiP, with storylines abruptly ending. Lots of opportunities to trigger sexual content with GIFs though.
• SQ Cruise Ship - This one has been abandoned but I still recommend giving it a play at least once. Focused more on conditioning and reprogramming than sexual content, though there is some.
• The Making of a Slut - Used to be really good. Current versions are criticized by the community for boring content and useless UI changes.
• Perverted Education - There is some drama surrounding this one. The creator removed all nonconsensual content in order to make the game safe for monetization. Game has kinda died since. Try the earlier versions if you can find them.
• Whoremaker - Different type of game where you manage a brothel and train slaves to make money for paying off ever-increasing debt. Has a sissy route that is kinda fun.

All of them can be found at tfgames.site.