Sex talk for 15 year old daughter

I've had to puberty talk with my daughter that had a little bit about sex but not a whole lot. She's been with her boyfriend a year. Some may recognize the story but he was new to school and she had a crush on him. He has autism like my husband (my daughter's daddy) and would get anxious whenever class got too loud so she spent several days looking for her old pink jacket and asked her dad if it felt like his blanket. When my husband gets anxious his blankie helps him so she thought the jacket felt the same as the blankie and would help him. And cute thing is he still wear it the jacket a year later. He was bullied badly out of his last school. There whole relationship had been VERY innocent. Innocent dates like movies and eating at McDonald's. Just very innocent stuff. It's been a year and they JUST kissed for the first time in Halloween. My daughter told me about it. They went as Ron and Hermione and she asked him if she could kiss him and he said yes. I'm thinking we need a more indebt sex talk now. I just don't know what to say. She's my oldest and my first time doing this. Tips would be well appreciated.