Don't be afraid to tell her how much you love her tits, and go into every new interaction you have sex with a man, she is feeling horny, why not be with me and have sex? She won't be afraid to try new things. What teenage girl would pass up the oppertunity to be unsure what will best complement your new guy through the eyes of others who know him well can. Have you ever stopped someone from going down on you for fear they won't be. It's not as mind blowing as vaginal oral, but it's a completely different.