Iinari ♀♂ Otoko no Ko

It was hours after school ended, but peeping in on the classroom I saw Natsuki Aida was still around, wearing girl's clothes, masturbating. Was this my chance to screw him (over)?
I took a picture of him for safekeeping. This would be what I use to make Natsuki my "slave"...

[Edited from DLsite English]