[Doemutan] Ikanai to Derarenai Heya

Quick translation. Page 1: Three childhood friends locked in a room and can't leave until they cum. A-kun (Boyfriend), B-ko (Girlfriend), and Chad-kun. Girlfriend says let's hurry up and get this over with, Boyfriend cums instantly from handjob. Page 2: Chad gets impatient with how long it's taking Boyfriend to make Girlfriend cum, asks to switch in. She says to just wait. Boyfriend says he won't let Chad touch her, he's her boyfriend so of course he'll make her cum. Boyfriend asks if something's wrong because it's taking her way longer than usual to cum. Girlfriend stutters, looking for an excuse, Chad points out that she must be faking her orgasm quickly when they usually have sex. Chad points out the timer on the wall, says they don't know what'll happen, pressures her. She agrees, apologising to her boyfriend and saying she'll make it up to him.

Page 3: Boyfriend leaves the room because he doesn't want to watch, isn't happy about it but tells himself it'll be over in a moment. Then he notices there's a one-way mirror into the room. Chad points out that he only touched girlfriend but she's really sensitive, she says her boyfriend just sucks. Cums instantly. Page 4: Chad says he needs to be able to cum too so he's going to have sex with her. He cums in her womb, making her orgasm again, and his handcuffs unlock. He mentions that he's pent up and that there's still plenty of time left, asks if she wants to keep fucking. She agrees while boyfriend watches on.