In the Chiguhagu Love Sick series:

V1. Chiguhagu Love Sick (Lovesick Odd Couple)
"You're this turned on when I've hardly touched you yet? What a naughty boy..." Kaoru is a tough guy with a secret he can't reveal to anyone: after getting chased down by the police... he likes to jack off!! But how could he possibly tell anyone about a fetish like that!? It's a secret he can never allow to get out. After Kaoru and his friend get involved in another police chase, his arousal demands his attention in the park. Just as he's about to masturbate... a police officer appears...!! When a cop catches Kaoru exposed, is his darkest fantasy going to become real...!!?

V2. Hatsujou Wanko wa Mate ga Dekinai!
Shibata Ken is a high school boy who is very interested in erotic things and his hobby is watching AV.
As a result of growing frustrated at an all-boys school surrounded by men, he dreams of his homeroom teacher Hime-chan (Himeno Yoshimi, 38, passionate teacher) serving his with his mouth...? !
Pure first love between a virgin high school boy and an old physical education teacher!