BL - No Good, Very Bad Men

While at a hot spring for their 6 month anniversary, Leo's boyfriend refuses to anything lovey-dovey with him due to being worried about appearances. Infuriated by his boyfriend's lack of affection, Leo decides to find a new partner for the trip. That's when he runs into handsome Ryouta, who came with his girlfriend and the two have an unforgettable one night affair. Leo thought that was the end of it, but then they meet again at Leo's company

Ch.1-3,6: Playboy Ryoya is dating his expressionless roommate Io. They originally got together since their bodies are compatible and Io likes Ryoya's scent, but Ryoya fell hard. However, even if Ryoya cheats or comes home late, Io never seems to care. Ryoya becomes concerned he's the only one in love