I need help, guys. I (24M) have been seeing my FWB (27F) for three months. We've had sex four times, with the last time being four days ago. Usually, our sessions last around 2 hours, but this time, after 1.5 hours, she had an orgasm earlier than usual. She was so horny and enjoyed it so much that she pushed herself away after she came. Literally 20 seconds later, she asked, “That’s fine, right?” I immediately told her it was totally fine because we always match each other's frequency in everything we talk about.
I also tried to explain that she was tired from work, was really horny, and that this fourth time was the most intense and romantic one yet. From her response during sex, I could tell she was really enjoying it, and I assured her that I was totally cool with it. We had clearly agreed that it's not necessary to have a "happy ending" every time, as long as we enjoy each other’s company.
However, when I was leaving, she seemed insecure about the beautiful orgasm she had. Any suggestions to make her feel more comfortable are welcome. Thanks in advance. I'm new to this, so I need some help here.