Thong Snatcher - Olivia Kinks Smartphone

You've gone sneaking through Olivia's room and have stolen one of her thongs. You don't care that Olivia is your stepsister...you find her hot! She's walked in and caught you WANKING your COCK with her THONG! Olivia threatens to tell your mum and dad what you're doing, but you've found some naughty stuff on her laptop. Surely you can both come to a horny agreement?