Mikako Abe absolutely loves the cowgirl position. But she never gets the chance to do it... She gets her hands on some super-strength erection pills, thinking that if she can make a cock rock hard, she might finally be able to ride it! First, she tests them out on her big brother to confirm the effect!! She's thrilled to see his cock standing rock hard right in front of her! She starts giving the pills to her teachers and classmates, getting unlimited cowgirl sex with their massive, hard cocks!! Then she takes some herself, becoming even more nympho, entering a runaway mode where she can't stop wanting to be pounded hard!!