Your girlfriend has just broken up with you because you cum too fast, and even tho your step sister finds this amusing and thinks that you are a little perv, she is willing to help you last longer. And so the edging training begins, and from time to time she will reward you with a tit fuck with her huge natural tits. At the end, as a prize for lasting so long, she let’s you cum between her tits with a final titty fuck.