Suki ni Sasete Miseru Kara! 3rd step

Synopsis

Hiro, a college student aiming to become a pastry chef, is in a loving relationship with his childhood friend, Shun. After having sex together for the first time, they should have been very happy, but Shun is acting a little strange!? "Now whenever I see Hiro, my heart keeps going doki-doki..." (Source: Comic Fleur, translated)