There are plenty of directions you can go after those firsts. Even after the character is fully corrupted/transformed, these are just off the top of my head:
So, the problem isn't that corruption is the be-all end-all of these stories, it's just a matter of imagination, time, and effort on the part of the writers and devs. Three things that this dev seems to struggle with.
- She becomes a pornstar
- The couple runs into money troubles and she becomes a prostitute
- She gets too into sex that the MC has to rescue her from herself, and the plot comes full circle where she's anti-corrupted
- They explore how far the lifestyle goes and how much he's devoted to her, with her becoming pregnant
- They start introducing other couples/friends/family to the lifestyle
- They start a swingers/sex club and start promoting the lifestyle publicly or in certain circles
So, the problem isn't that corruption is the be-all end-all of these stories, it's just a matter of imagination, time, and effort on the part of the writers and devs. Three things that this dev seems to struggle with.