WARUIKO NO AISHIKATA

Waruiko no Aishikata summary:

He's straight, a prostitute, and 12 years younger than me. I never should have gotten involved... now that I'm stuck with him, there's no going back.One night, Akihito visits his usual gay bar where, on a whim, helps a young man, Seia, getting harassed by a customer. By doing so, Seia offers Akihito... "want to have a good time with me tonight?" Akihito takes him to a VIP room with devilish intentions to tease him, but upon seeing his innocent reactions, a rush of warmth spread throughout his entire body...