Yamome no Tamago

Yamome no Tamago manga summary: After being abandoned by his lover, Motomi vows to become an artist. One day, he is brought home by Nueno Koji, the artist he admires. That night while resting in Koji's room, Motomi accidentally saw what was going on in his neighbor's house through the window, and unexpectedly it evoked uncontrollable excitement and lust...?!