Min styvsyster tycker om att ha sex med mig mer än med sin pojkvän

My stepsister complains all the time that her boyfriend doesn't know how to touch her or make her wet. She also says that she doesn't enjoy when he kisses her because, apparently, he doesn't know how to kiss. So my stepsister turns to me to satisfy her carnal desires, since I know her body very well and I make her reach the stars, like in this video.