1girl, girl squatting on top facing forward, deep vaginal penetration, constant unbroken rhythm endless perpetual thrusting cycle fluid continuous non-stop in-out motion no pause no reset no jerk perfect seamless smooth loop from full insertion to withdrawal and back, Rin Tohsaka squatting straddling over guy, long black hair twin tails, sharp blue eyes, confident tsundere expression, fair skin, canonical red turtleneck pulled down low exposing boobs skirt hiked, black thigh-high stockings, athletic adult female build natural proportions, 1guy, penis, lying on back, regular penis thrusting fully upward into tight vagina, tight pussy gripping shaft, slick thick arousal coating shaft, hips bouncing rhythmically, breasts exposed jiggling, intense blue eye contact downward, sweat glistening skin, soft bedroom lighting, anime realism hybrid with accurate anime model look detailed realistic skin texture realistic shading lighting anime style eyes hair semi-realistic proportions vibrant colors, ultra-detailed 4k seamless loop