how do I feel my girlfriend up?
hahaha. Yeah, im sorta laughing at you. Not to be mean or anything. First things first, make sure she is ready. Dont just reach up and grab her boobs. Move into it slowly. Start by kissing her, stroking her hair, the usual. Then let you hand drift to her waist, over her stomach. If you want, lift her shirt a bit and rub the skin right above her jeans. First let your hand work up to her breasts, but do it slowly, so slow shes begging for it in her mind. Then finally just stroke her breast over her shirt, squeeze rub, just play around, do whatever you want. If shes comfortable, go under shirt. Theres not much technique to it. If she leans into your hand though, squeeze harder.
Use your hands. Take it slow. Pay attention to her if she wants more, less, etc.