masturbate once in the morning before she comes over, twice maximum so you can still get a hard on.. Anyway, this can work for you. I have been off masturbation for so long as it does affect my game if I do it( i get addicted to it when I do it so i just quit it). You should also learn to control yourself. Here is few tips: Take long breathes while you are in an intercourse as your heart beat will pump slower causing you to cum later. Also before cumming either make her stop and then fingering her taking few minutes break and then make her do it again, and lastly just think of your grandmother when you are about to cum.( will make you last longer trust me
) lol