Izuku Midoriya is a merman who has been captured after they noticed his pod's lack of presence. They decide to capture and study him, since a merperson without a fog is like free food to other marine predators.

”Fuck it. Oi, what are a merperson's courting rituals?” Katsuki asked his friends.

Kirishima and Denki exchange looks. ”Why are you asking,Bakubr— OH!” Kirishima exclaims, realization dawning on him.

Katsuki wants to court the merman.