After examining this picture, it looks like the manga artist depicted a girl on a bed dressed in clothing as though it is hot in the summer.
On close examination, the girl is laying on what appears to be a bunny's face. Her right hand is on her right derriere.
I'm uncertain what the object in front of her on the bed near her right thigh. I'm going to assume it is a brownie or a cupcake. :)
