It's yaoi where the seme end up dating his brother in law, so one time they get into a fight and since the seme wanna ask for forgiveness he end up sleeping with the uke's twin and without knowing and he also end up sleeping with the uke's others twins, we foud out the uke is a quadruplets and the seme end up sleeping by error with the other siblings
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Bro...wtf is that? Thats literally cheating eww
He didn't knew