hand on another's penis
A character with their hand resting on or grabbing another character's penis.
This tag is most useful in cases where a character is not performing a handjob (which inherently involves a hand on their partner's penis) or where there are multiple male or intersex characters with penises in the scene, and the differentiation is helpful. This can also be useful in distinguishing which character is holding/lifting/supporting or forcefully grasping a penis in a given scene.