1. Cook her favorite meal for her, girls love it when you go that extra mile to make them something simple but special.
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4. My girlfriend is similair, she has large breasts for a girl her age and they can cause her pain during sex due to the weight of them. Make sure that they arent pulling on her chest and if they are just put her bra back on and she will be fine.
5. Wait for her to make the next move. If something goes wrong she might need some time to recover e.g. if your too big for her then you can make a small cut in the clitoris which causes stinging pain and mild discomfort. Let her tell you when she is ready to have another go.
Hope this helped dude and best wishes for the future