我的继妹让我教她不同的性姿势

My stepsister has just turned 18 and wants to try everything, at all times she looks for me and lets me see her private parts to see if I dare to her, and today it was like that, today she turned me on a lot and I really wanted to her, every time she asks me to make a different position to turn on and that she can do it with her boyfriend.