To have your partner suck on your balls too during a blowjob as a form of foreplay before sex. To have your partner suck one or both balls soft or hard to stimulate them before sex.
Jen put my balls in her mouth and gave them a good hard ball sucking during foreplay. This made them feel stimulated and ready for action.
When one gentley suckles upon another's scrotum. The soft and wrinkly sac greatly enjoys this motion.
Jared: Wenday, please practice ball sucking on me baby cheeks.
Wendy: Hell no you sick twisted cowboy basterd. Only if you toss my salad...bitch!