I kissed this boy but he is my best friends brother?

Im 14 nearly 15 .It wasn't just a little peck it was a proper snog and everything it felt really good but it was in front of my best friend as he is her brother. We where in there hot tub and it was really romantic. I really like him and that night we must of got off about 15 times he is a really good kisser what do i do ? please help and my other questions too xx