How to introduce futas into a setting?

Story by Middlesex

I'm re-writing an old story of mine that combines a bunch of superhero tropes with a bunch of mutant-powered futanari sex scenes. What I'm hoping to do is start the story with some heroic action scenes with the main characters fighting badguys, which works as a setup to establish worldbuilding and let them have some banter and character building. But it seems really abrupt when the scene changes and I start introducing the fact that the heroes are all oversexed futas. And as much as I try to drop hints at that fact during the fight scenes, it feels really weird and out of tone.

Are there clever ways I could set up the "this is an erotic story about girls with cocks" theme during a scene where it's really not the main focus without... I don't know, starting to feel like an X-Men porn parody or something?