水科 蛍
from Netsuzou TRap (NTR)
She is Yuma's childhood friend, who plays sexual pranks on Yuma. When Hotaru was young she was timid and shy, and was bullied a lot. She also gives Yuma relationship advice and claims that she wants to be Yuma's first.

Netsuzou TRap (NTR)
Yuma and Hotaru have been friends since childhood, so it's only natural that when Yuma is nervous about her new boyfriend, she asks Hotaru for advice. But when Hotaru starts coming onto Yuma for what feels like more than just 'practice,' what does it mean...? With boyfriends in the foreground but a secret, passionate tryst in the background, will Yuma and Hotaru try to forget what happened between them or have they fallen into a trap of true love and betrayal?