He targets big asses he finds on the street, and when he sees them on a bus, he pretends it's a coincidence at first and makes contact with them. He then rubs his dick against their asses. They try to resist, but their asses are defenseless with their bags in both hands. Eventually, as he enjoys touching their asses to his heart's content, kneading their asses and smearing cream all over them, the women gradually get turned on and start giving him handjobs and blowjobs. Then he penetrates them from behind while admiring their asses.