Dekiai Contract: Yachin wa Karada de Haraimasu!?

There are three rules for living with my cousin Tsukasa. First, Tsukasa takes care of all the rent and bills. Second, I take care of all the chores... and the third rule, which we keep secret from our parents... I pay my rent with my body. I took advantage of Tsukasa's joke and made it a contract. But... How does Tsukasa feel about me, I wonder? I've always loved Tsukasa... But, I'm too scared to ask him how he feels, and in the meantime he's just training my body...

(Source: Renta!)