My baby-faced adult stepsister pretends to be innocent, but gradually reveals that she is wildly promiscuous and determined to take my virginity. Ever since learning that I am a virgin, she has seduced and teased me until I get completely hard. Then she proposes a game: if I can withstand her technique for three minutes, she will let me fuck her without a condom and even cum inside. I accept my stepsister’s test—but how will the challenge end?