Osananajimi no Oppai ni Katenai! The Motion Anime

The main character Hiro and his childhood friend Hinata have been in love for a long time. Every time they see Hinata and her huge, shapely cheeks, Hiro involuntarily gets an erection. Tachibana, of course, sees her boyfriend's reaction. One day she visits Hiro's room and confesses her love. Afterwards, Hiro enjoys Hinata's ample breasts, and then they have their first sex....