trying to find a hentai manga. a woman is being blackmailed by a guy, or maybe needs money for him or something. he somehow captures her, i think the envelopr with the thing she needed was on a trapdoor over a pit, and she's forced to climb a wall of dildos to get out (not pic related, just the closest thing my searching finds). later she's forced to walk along a bar pressed to her crotch with a series of grooves to stimulate her. think it ends with the typical 'haha i have now made you my sex slave' stuff.
All I remember clearly about it is that it's an outdoor scene, next to a fence, and one of the girls is the victim and gags every time she is made to lick the other while on her knees. Her acting/reaction really sold the scene. The scene might be after she was gangbanged in van by some dudes, but I don't remember if that was just another video I saw around the same time.
It's rare to see 'real' or visceral reactions to things in JAV, so her being or acting grossed out has stuck in my memory, but I have no hope of finding a half-decade lost JAV without help.