WAAA-639: My cute but slightly meddlesome childhood friend, Mei, who I've had a complicated relationship with for ages, unexpectedly asks me, "I want you to be my sex practice partner!" Armed with just one condom, our sex practice begins with clumsy movements. It was only supposed to be one time, but Mei, who has awakened to the pleasure of sex, becomes incredibly insatiable!? She keeps coming and coming, and I ejaculate 10 times without a break. She never knew that fellatio, cunnilingus, and cumming inside could feel this good... My parents...