The sisters who go to their brother's room get turned on by their brother and have sex with him, licking his cock and licking his cock.

The older sisters (Narumi Miu, Tsubaki Rika, Hanamiya Amu) who visit their younger brother's room after he starts living alone become aroused by him and end up giving him blowjobs and cunnilingus more than they could handle, and end up f*cking him raw and creampied!