Girls, I came in my pants cause my best friend sat on my lap, how do I sort this with her?

Yes very embarrassing we were just chilling playing video games and she was just messing whilst we had a smoke, and I do think she is really hot but I don't think I have a crush but she has a really nice bum.
But yeah it was too much and that happened neither one of us knew what to do and I left very quickly please tell me I can fix this with her?
Girls, I came in my pants cause my best friend sat on my lap, how do I sort this with her?
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