Трахаю подругу моей сводной сестры в ее комнате

My stepsister's best friend has always had a crush on me, and I've always liked her too, but we hadn't had a chance to be alone, until today. My stepsister went to take a call from her boyfriend, and she leaves her friend and me alone, so we seize the moment and have sex, since my stepsister always takes forever to hang up a call.