1. Delivery man x scent fetish. Uke chooses boyfriend from their scent. Uke likes the seme's scent and they have sex. But uke gradually feels sorry for deceiving him.
2. Childhood friends. Seme comes home from America. Seme says he has someone he likes. Seme knew years ago uke was jerking off seme. Then seme sneaks into uke's room bcs he doesn't want to come out.
Koisuru Futari no Taion