I guess I'm the only one who thought it was inside his butt xxxx (=・ω・=)

help i thought so too

He wouldn't find out until he had a colonoscopy or something then, which would honestly be a really hilarious premise

I was wondering if ML's surname would "peak out" a bit when doing "stretching exercises" lols.

Nooo, "inside his butt" as between his asscheeks, not on his intestines Σ( ￣□￣||)