This originally was a custom which luckily for you I have been allowed to share. Your geeky girlfriend wants to do drain all of the precum from your cock before she lets you come. She loves your precum, so she does a lot of precum extraction, squeezing it out of your cock, making strings between her fingers, licking it off her fingers and sucking it out of the tip of your cock. If you're after a a slow, edging scene with lots of tongue and sweet teasing this video is for you.