Piss kink GraceRocky. Rocky is obsessed with all the way his human's body responds involuntarily, from noises to leaking to trembling, he barely needs to do anything and Grace responds in such a beautiful way. The first time Grace overworks himself and suddenly has to piss real bad, he's squirming in his lab seat and dashing towards the dormitory calling out to Mary. Rocky finds out when they're in the Don't Go Crazy room that water sounds can make humans need to pee, such involuntary creatures... Grace groans and tries to get up while mumbling, but Rocky rolls his ball between his legs and tells him to stay. Grace doesn't know how to respond to that, blood rising towards his cheeks and mouth flapping uselessly with words that won't come out. Eventually he gathers himself and tries to talk some sense into Rocky, trying to figure out what's going on with his buddy. Rocky manages to keep him in the room long enough to get what he wants, Grace starts squirming and trembling slightly as he attempts to close his legs, but Rocky stays firm in his ball and only presses in closer. Listening to the hitch in Grace's breath, the whine in the back of his throat, and the eventual begging. When tears spring into Grace's eyes Rocky figures he's used up all his plausible deniability, and let's Grace go. Grace stumbles and trembles and walks agonisingly slow, still whining pathetically in the back of his throat, and Rocky follows him, getting the best picture of his human's desperation.

















