Rin Aoki sketches out an erect cock as part of a personal sex education lesson. To continue Rin drops to her knees and reaches for her students cock. When she finds it limp Rin bares her huge breasts and takes the now hardening cock in her hand, stroking it to full erection. As it rises Rin continues her explanation of it's function. The practical part of the course reached Rin quickens the pace, her tongue extending to the tip of her students cock until he cums over her breasts.