
I’m assuming you mean for a 🍆, so in my personal experience start slowly. Use ur tongue to like slowly wrap around it and sort of like “tease” it, similar to how slowly dragging fingers along someone’s arm will give goosebumps. Same thing, but w/ ur tongue on a 🍆. And then just gently use suction while doing that with your tongue and start sliding your mouth up and down, starting off slow, then respond based on how the guy is reacting. If he’s clearly enjoying it, keep doing that :)
Also - use one hand and depending on the size of it, wrap your hand or a few fingers around the base of it below where your mouth is to cover more surface area. Then what I like to do is using my other hand, I’ll grab the balls and gently use my fingers to massage them while holding them in my palm. This area is very delicate and gentle, so tread carefully & with caution lol