Try The Null Hypothesis for better written X-Men content, but doesn't really have the trainer aspect. And fewer girls. Null has basically Zero's same power, with the difference of instead of aphrodisiac touch he can low level copy the girls powers (mainly factors into the story, not the sex content). He's more of a "switch" romantically, with Rogue being fairly submissive while Laura basically makes you her pet lol. You can mitigate it somewhat with dialogue how much you allow her to lean into that.
If you want more Sandbox hero slut trainer stuff, try Something Unlimited (Lex-focused DC harem) or maybe Domination. I haven't played that one, but it looks in a similar vein.
