My girlfriend's younger sister is such a sweet girl; she gave me an incredibly pleasurable assjob! She showed off her big ass, vigorously fucking me, making my buttocks tremble uncontrollably, squeezing my genitals with all her might until my testicles were empty. (Yayoi Mizuki HODV-21986)

"You like big butts, right?" My girlfriend's older sister's bouncy buttocks gripped my penis, and I started thrusting! I'd always admired my girlfriend's older sister's big, smiling buttocks—and now that she'd discovered it!! Seduced by her incredibly erotic face, my erection control was off. To avoid being discovered by my girlfriend, I rubbed her buttocks while having sex, ejaculating repeatedly on her alluring backside, using lubricant to make her buttocks soaking wet…etc., resulting in several ejaculations!