You were at a party with your friends when this emo chick and you hit it off. As you two kissed she slipped a pill down your throat and you were attacked by a monster in the park... infected... becoming a superhuman in a very ahem lewd way

"Ah, so you're compatible with monsters after all! Wonderful~! How do you feel?"

Ella would say in a seductive tone with a joyous smile as you lay tied up in her appartment.