Wedding Blues 

It's wedding day for the groom-to-be, Aki. While waiting in the changing room, Jun, his childhood friend with whom he had lost contact with, appeared. Aki once had unrequited feelings for Jun, and their sudden reunion has him dazed and confused. Doubting Aki's true feelings about the wedding, Jun kisses him. Aki rises in anger at Jun for stirring up his emotions. However, he's unable to resist the temptation. Once he starts, he can't stop. (Source: Fusion Product) Note: Includes one extra chapter.