IDEALLY this is like a '5 times GrindelGraves made Credence pee and it was really humiliating but also hot' BUT any one of these scenarios would make my day
stuff like: GrindelGraves making Credence pee on his cock while GrindelGraves jerks off and then returns the favor for Credence
GrindelGraves making Credence stay soft and he fucks him until he pees
GrindelGraves making Credence bury his cock right up to the hilt in GrindelGraves' mouth and pee
Doing some kind of magic/mindfuck thing where when Credence pees he experiences it as an orgasm
Just generally Credence being trained to pee right through his clothes on command whenever and wherever GrindelGraves pleases, regardless of who might be watching
BONUS if Credence already has some major hangup about peeing where he isn't supposed to e.g. he used to wet the bed and Mary Lou beat him real bad for it, and the stuff with GrindelGraves is done in the context of Credence needing to let go. Also PLEASE feel free to have GrindelGraves abuse the fuck out of the imperius curse to MAKE him let go
GrindelGraves/Credence -- watersports...probably at least dubcon?
stuff like: GrindelGraves making Credence pee on his cock while GrindelGraves jerks off and then returns the favor for Credence
GrindelGraves making Credence stay soft and he fucks him until he pees
GrindelGraves making Credence bury his cock right up to the hilt in GrindelGraves' mouth and pee
Doing some kind of magic/mindfuck thing where when Credence pees he experiences it as an orgasm
Just generally Credence being trained to pee right through his clothes on command whenever and wherever GrindelGraves pleases, regardless of who might be watching
BONUS if Credence already has some major hangup about peeing where he isn't supposed to e.g. he used to wet the bed and Mary Lou beat him real bad for it, and the stuff with GrindelGraves is done in the context of Credence needing to let go. Also PLEASE feel free to have GrindelGraves abuse the fuck out of the imperius curse to MAKE him let go