It's all about being a smooth talker. You just have to be confident in what you're doing but not cocky. Let her have some control for the beginning but if things aren't going in the direction you like, pick up the pace and start calling the shots. Personally, when a dude hits me up to chill, smoke, and just watch a game I find it attractive. It's simple, and fun for us both. From that point, I let things so where they will. If I'm attracted to the guy, I'm down. If I'm not attracted then I keep my distance.
Tell her your dick is like a round toy in pre-school, and it can only fit in her hole. Show her a picture for reference.