The Plain, Shy, Glasses-wearing Sister At Her Part-time Job Is An Adulterous, Lascivious Monster, Rio Asahi.

A woman stands quietly in a calm café... She's a capable but plain café clerk with a hidden side... 'My lower back hurts... Could you rub it for me...?' Unable to suppress her sexual desires, she transforms into a lewd beast, seducing men and indulging in pleasure...! 'More... You can satisfy me more, can't you...?' With a long tongue and dirty talk unimaginable from her quiet demeanor, she mounts a penis erect to its limit from edging, rocking her hips until she's satisfied—a true monster. Even after climaxing and being creampied, her insatiable lust drives her to seduce men again today...