So, I'm a 22 year old guy andI've known my best friend and his older sister for about 15 years. I've always thought she was hot, but she was a few years ahead of us in school and she's also a good friend of my older sister so I obviously never tried anything. She recently split up with her boyfriend of several months and I bumped into her at a bar over the weekend. One thing led to another and we started making out and eventually we went back to her place and had sex. Afterwards I thought I had taken advantage of her so I texted her to apologise but she texted me back that it was exactly what she needed in the moment and she wants us to start having casual sex on a regular basis. On one hand, she is the best sex I've had in months and sleeping with a hot older woman is a huge fantasy, especially since it's taboo. On the other hand, if my friend or my sister found out they would be seriously mad and my friend may not forgive me. So what should I do?