私の義理の妹は誤って私にバイアグラを与え、私は彼女の口の中で射精してしまいます。

My little stepsister very gently offers me a delicious aphrodisiac juice that she knows I like a lot, what she doesn't know is that instead of adding sweetener, she gets confused and gives me my stepfather's Viagra, that makes me horny and fuck her very hard and cum in her mouth.