Does my girlfriend want me to touch her ?

Well today while i was sitting on her bed. I could feel her on my leg while she laying down, she didn't even move. She is like 36a for her size. Next she putted her on my shoulder, when she hugged me from behind. I must admit it felt really good. Then i noticed her were like coming out of her top, her strap was coming sliding off. I told my girlfriend that her strap was coming off, and she told me to fix it. When i tried to fix it, she moved a bit and my hand touched her . Her nipple felt hard when i touched it. But does she want me to touch her breast, this is my first time in a relationship. We are both 19 and dated for a year.