Doukyuusei Kareshi ni Jirasaretemasu.

Kiri likes his classmate Fuji. He really likes him. He likes him so much that he can't stand it anymore. Whether he knows about his feelings or not, they're always together, flirting with each other every day, so Kiri can't confess his feelings... Just when he's struggling to let out his sad feelings by masturbating, Fuji comes over to play and sees him right in the act... > < You can probably guess what happens next, right? A volume of short stories.