Atsushi, Marina's homeroom teacher and boyfriend, used to date Marina's older sister, Emi. One day, Atsushi is surprised to find out that the two are sisters. The sisters also find out and become rivals in love, clashing fiercely over Atsushi. Naturally, they fight over his dick! Quadruple (four) breasts give him a titjob in the face from all sides! Fingering and thrusting into the two beautiful big asses! They share the same genes, but missionary, cowgirl and doggy style give them all different pleasures! "I'll make you both happy, so I'll let you cum inside me."