Nipple fucking 

When someone insert something into a nipple.

Mostly seen on absurd porn (mainly hentai).

You can learn more here nipplefucking.com.

He came into the tits of that girl after nipple fucking it by it's small hole.

Nipple fucking by MaverickMorty September 7, 2018

Nipple Fucking 

This is an act where a female inserts her hard erect nipple
into the eye of the male penis,resembling the act of intercourse.

Leslia likes nipple fucking in edward for long hard hours.

Nipple Fucking by Billy Barry Lewis October 18, 2008