Starting a Misteress Contract with a Childhood Buddy

Why did he ever have to fall in love with a guy like Taichiro!? Mr. Super-Aggressive continues to be shaken up by his super airhead pal from childhood.

Handsome Tetsuji Aoi, fawned on by all the ladies, is the charismatic owner of an illegal casino. His only weakness is Taichiro, a guy he grew up with. He doesn't mind it, though, because his bright, cheerful, and unpredictable friend is the love of his life.
One day, Taichiro comes to Tetsuji and suddenly declares that he'll be his mistress!
Tetsuji starts touching innocent Taichiro's body hoping to scare him off, but the person he has forever had a crush on begins to get irresistibly aroused, and he doesn't know if he'll be able to keep his cool...

(Source: Renta!)