Chihiro, Gakkou ni Ike!

A shut-in girl is being taken care of by none other than her older brother. Her room is cluttered to no end, and because she refuses to take baths, he has to force her to take them! He's unable to turn down his younger sister's requests for him to wipe dry her spoiled body after... because her chubby body's tender flesh feels good to touch, no...