Sooo, just let them escape? Not trying to catch them to interrogate and learn more about that pandemic they're about to unleash, possibly a way to prevent that? No?
You see THIS is why THOT-BE-GONE is a thing. Some girls, no matter HOW SEXY need to be put down. Mr. Gutter Brain is HELLA protesting but I can distract him with some sword-pulling squirting.
The enemy are cute girls who want to absolutely murder them all. And since the MC is a perverted hero. Clearly the answer is he will give them a heroic orgasm and they'll convert to the good guy side.
Or they'll actually have an unexpected twist and he will actually kill them.