In short, it’s a neat variation on oral sex, allowing you to take what might be a much needed break from sucking his penis. He stands above you or squats over you, dipping his balls in your mouth – and you handle with care!
Keep your tongue wet with saliva, open wide – and keep your mouth wide – and lick and swirl. Experiment. Try varying the strokes and the pressure. Judge from the moans what’s working best.
Try also gently nibbling on the loose, wrinkly skin surrounding the testicles. For some men, this is heaven, for others, too, too much – he’s too sensitive. Again, check your partner’s responses.
For a different sensation, use your fingers to form a ring around the base of his scrotum and pull the testicles down. This stretches and smoothes the skin, changing the sensation of your tongue as it moves across it.
Take care not to crush his balls. Concentrate on pleasuring the skin, not knocking, jolting or otherwise injuring the family jewels inside.