玉ズリ
A sex act in which a person (male or futanari) has their [[penis]] rubbed in between their partner's [[testicles|scrotum]]. In other words, its like [[Paizuri]] or titty fucking, but with balls instead of breasts. Also known as 'tamazuri' (玉ズリ) is Japanese.

h4. See also
* [[penis and testicles touching]]
balljob