Gee, I wonder

You'll do fine, hon. Smoke some weed, put on a movie, dim the lights and take it slow. I suggest cumming before hand if you know you can get hard again to pleasure her. If you aren't able to do that, I would save the cumming for the 'grand finale". Don't forget to get her nice and wet so she's as comfortable as possible during the first time, 'cause it's her's too! Take is slow, be romantic and rock this girl's world