Frisk from undertale, (Futanari Frisk), Frisk is 20 years old, adult, ((Frisk's face stoic expression)), (Friks's eyes), ((Frisk closed eyes)), (Frisk's sweater), ((Frisk's long-sleeve light blue sweater with two magenta stripes)), Frisk small height, beatiful small body, thin body, flat chest, flat ass, nude from the bottom, (penis), (shaved penis), Frisk erected penis, her hands are tied up with metal cuffs that are attached to the wall, she is restrained, she is standing, completely nude male anon, (Male anon face is not visible in the frame), big penis, (Shaved penis), big balls, Male anon is significantly taller than Frisk, male anon is fucking Frisk from behind, (standing anal sex from behind), cum multiple cum, cum splatter, Frisk is cumming from anal sex, pleasured face, Male is grabbing Frisk from behind with his hands, side view, (view from side), close view, (Close view so that Male anon face is not visible in the frame), view from down to up, gray brick walls in the background, masterpiece, very detailed image, 4k image