LadyBelle's manga / #Sex friend(3)

1. Sex friend introduces his twin brother. It moves to a 3p, then the twin falls in love. 2. Friends who started dating and living together. One is unemployed and obsessed with the other (and has a slight pee fetish) so when he starts going out and working on his computer all the time, his lover gets worried. 3. Man rejects his best friend after a graduation confession. Years later they meet again as coworkers. 4. Playboy catches otaku taking pictures of a popular girl and blackmails him into being his slave.