Responses

uniballs? are y'all serious? balls usually tighten up like that when the person approaches orgasm, it's part of the mechanism of ejaculation.
of course there are people with 1 testicle (born with 1 or lost one after injury or cancer), but that's different as it's permanent unless they opt for a silicone or saline testicular implant. but that's not the context here.
Someone teach this artist how to draw balls..