For me, there is a huge connection between my nipple and clit,
I had a boyfriend who loved to suckle from my breasts. When he did it slowly as a baby would nurse it was relaxing and erotic.
As I would get excited, he would change the tempo of his suckling and make me come just from the suckling while holding my wrists so I could not touch myself.
Other times, he would suckle me and keep me on the edge while I begged him to enter me and let me come.
Sometimes he would, other times he'd use his hand to make me come.
I wish more men liked it that much!