
I know of a thing, you put the nipple between your teeth and almost bite (do NOT fully bite down unless they want you to) and then loosen up, it’ll be like ‘squish squish squish squish squish’ type thing, I’m pretty sure a lot of tit havers love that There’s also the whole boob to suck, not just the tip of the tit. Go everywhere, between the two if you want. Some people like their tits marked, and you can get away with a looooooot more suction than a hickey on the neck (that can be dangerous)
As for pressure, instead of teeth try pressing the nipple between your tongue and the roof of your mouth(medium level technique). Also try using the inside of your lips and sliding it back and forth with suction(helps to have big lips). You’ll know you’re doing it right by the feedback you get from your partner