Stepsister Shows Her Tanlines

Your stepsister just came back from the beach and she wants to show her nice tan, and tanlines. You joke around to see all her tanlines and she just goes for it and you get to see her bare tits. Now the game is on and she wants to see your tanlines too. Your cock is so hard she cant resist but to take a look and play around with it a little bit. How far does this fun