Mion no Chichi to Kurashitemasu

Akito's a high-school boy living with his stepdad, Kazuyoshi, who saved him from a rough childhood and raised him as his own. He's been attached to Kazuyoshi for a long time, but these days, he's even started touching himself to thoughts of his "dad." He wants Kazuyoshi so bad... One night, Akito's trying desperately to suppress his desires when he sees Kazuyoshi vulnerable and asleep... and all reason goes out the window!

(Source: Renta!)