After School NyanNyan (2011) +18

Original title: 放課後にゃんにゃん

This is a hentai about first love and, more importantly, the first time. The first story, for example, is about an unnamed schoolgirl who has heard a lot about sex but lacks any experience whatsoever. Interested in everything, she asks her underclassman Yu to masturbate in front of her. It doesn't take long before the two shake off their embarrassment and do more than just masturbation for each other.