>Hiro and 02 LITERALLY fuck like rabbits
>they do it at least 10 times a day maybe more
>they have such blatant disregard for everyone else that they've been walked in on countless times
>they still continue to fuck anyway
>Zero Tsu realizes she's infertile because at least one of those sperm would have stuck
>She doesn't realize Hiro's sperm won't be compatible until he goes full oni