Les and her friends have a 3P sex with their boyfriend, vol.2 says

He and his boyfriend set up a camera in the room where they live, satisfying their sexual desires every day. On the way home from the drinking party, Kuwana invites her target friend to drink in the room. Responding to friends pretending to be drunk. Then call him while taking a shower. Two people play a bad game with him pretending to sleep muddy. She signaled that he would wake up and lick into 3P.