My tomboyish childhood friend, Moka, who I've had a complicated relationship with, unexpectedly asks me to be her sex practice partner! Armed with just one condom, we begin our sex practice with clumsy hands. It was only supposed to be one time, but Moka, who has awakened to the pleasure of sex, becomes incredibly horny!? She keeps coming and coming, 10 times without a break. She never knew that fellatio, cunnilingus, and cumming inside could feel this good... With our parents away for three days, all restraints are gone...