Answer
I think you already know the answer, you are just looking for confirmation, maybe you are young and in experienced, but I'd assume that the guy has made plenty of gestures vocally about your breasts to let you know what he wants, but don't be fooled. Maybe that's all he wants. Is that what you want, to be used because you have large breasts, and when he's finally had his hands full of them, and probably everything else, he drops you and believe me, you will feel bad.
HE WANTS SEX!!!!!