Don't Tell My Stepbrother

You stayed over at a friend's house last night, but when you woke up he had already left for work... Luckily his stepsister is in and you've always had a crush on her. She's also about to leave, but she needs her charger before she goes... So she bends over the couch in the lounge to grab it, revealing her bare arse under her short-short skirt... Perfect.