Imprison them

Suddenly, transparent walls surrounded Ultramom and Ultraboy. They tried to break free, but without any visible effects. Their powerful strikes could not break the transparent walls.

“Let me tell you first, I’m not a simple brute, but a woman of science. I always found superheroes very interesting. You’re supreme kind with superpowers. Can you imagine what could happened if superheroine is impregnated by superhero? Their child should be most powerful person in the world!”

Ultramom had a feeling that Erika is planning something bad for her, so she doubled her efforts with striking the walls. Erika ignored her and continued her talk.

“So, I needed two superheroes, male and female. And voila, you two came here, just like I wished. You’re young, healthy and strong. You’ll be perfect parents for a supreme child”.

“Fuck you!” said Ultraboy “I’ll never do such thing with my mom…”
“I thought you’ll say so…” said Erika “But luckily, I have a way to convince both of you to be much more cooperative…”