get her close by using oral first,take a good half hour or more , if she seems to be ready to cum,then back off ,and take it easier,so she's about to explode, if you tongue her right,you barely need to touch her clit,

if you shoot to fast, rub some neosporin cream on your wacker, it will just slightly numb you the first few minutes of screwing, of course Ive never tried it