I was confused first but then it came to me.. Does he mean by mistake that they might've m...

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by "mistake", puppy meant using chiyoung as a "human dildo"

He's most likely saying he doesnt mind getting dicked down real good to the point he's being used like a fleshlight since the top loses all reason and just fucks him as hard as he can (remember, the top always feel remorseful bc he cant remember them fucking like rabbits whenever hes in pheremone shocks bc hes scared he might have hurt the bottom during the time hes blacked out)