I so love thinking about Bucky being so detached from his own body; basically just reverted to a kid, or even an animal. looking down on himself and being mildly confused about his thick cock and how it fills his pants. Maybe even just annoyed that it will make fighting harder.
But he’s so well trained.. just walks right on Brock’s heels like a dog; has only eyes for his handler and doesn’t even bat an eyelash when he’s made to strip or pissed on.