In Love with My Slave(2005)

Koisuru Nidorei-chan

Bad boy Itta-chan confesses (!?) his feelings for the guileless Riri,and makes her his slave. But his "meanness" is really kind and feels good... Riri is happy just having him rub her head. Riri wants to be part of a regular couple with Itta-chan,so she informs him that she's quitting as his slave. But Itta-chan misunderstands,and thinks she wants to leave him...!?

(Source: Renta!)