humping belly
When a character is thrusting their hips to rub/grind their genitalia against their own, or another character's belly.
When a character is humping their own belly, they are usually resting atop their own massively bloated belly; characters masturbating in this way is especially common in same size vore content.
A character humping another's belly may be straddling or sitting on top of the character's belly
May Involve...
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The following tags are aliased to this tag: belly_hump, belly_humping (learn more).