I'm maybe be wrong but I'm pretty sure he peed after he came
its yaoi but works with any book really, it doesnt need to be accurate.....
when it's porn sometimes it doesn't make any sense
pretty sure there's a kink based on peeing, like people who take pleasure on being teased until they pee/peeing on others/getting pee on themselves
They don't come at the same time they pee, but mangas usually make it look like it
Welcome to the kink world
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I think he came so much that there was none left, so since his body had to release some liquid he peed.
Or he could'be squirted.
my sex ed eacher told me that dudes cant piss and cum at the same time yall gotta explain this fuckery