GGGB I guess, it's one of the few games that don't have a corruptor or unavoidable coercion of MC.
Though it's far from complete and does have initially non-consenting mind-control,
SB is one of the most sex-positive corruption games I've played, with a focus on free-use and exhib.
If you happen to have Fallout 4 with DLCs,
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might be worth a look for a prostitution-driven corruption story where you can have MC be willingly submissive and happily corrupted by the end of content. It does have unavoidable rapey scenes, though not unavoidable mindbreak.