literally!!!
Well he had his ass modified in order to wet itself so here it make sense lol
Yea, but they never tell what the modifcation affects to the body. We dont even know what's changing from him other than "he becomes more sensitive"
I dont think even the author knows what kind of modification it was
It's porn so logic isn't necessary
it always cracks me up when in yaoi they're like "you're so wet down here~~~" because, biologically, WHAT is that supposed to be to quote trixie mattel: "baby, that's shit"