Girlfriend’s first time with another man

I wrote a small confession about how I excited I was when she first told me about wanting to open up if you want some backstory, but last night my beautiful 38 year old girlfriend went on a date with a younger guy and decided to go all the way. My girlfriend loves nice cars, and had told me she planned on giving him roadhead in his nice Porsche SUV. We live in the same complex, I dropped her off to him and told her to have fun, got some text updates here and there but no pics or videos were sent. He took her to dinner and the beach, I was surprised he didn’t mention a hotel but given the fact that between our place and his place we have 2 beds within a 5 minute walk, it makes sense. When they returned I got a text from my wife asking me to pick her up where I dropped her off, so I went to the garage and saw the car absolutely rocking. I stayed back for a minute or two until I worked up the courage to open the back door and saw her getting fucked in the backseat. I was so hard and horny I could not move, I just stood there with the door open rubbing my cock over my pants as I watched this younger black guy destroy her in the backseat of his Porsche. She told me to go in the front and by the time I got inside I had just missed him cumming on her pussy and stomach. I just sat there and stared at her cum covered body while they laughed and kissed. Everything about the encounter was so hot, the fact that she thanked him for fucking her, asked me to thank him, the fact that there were other people in the parking garage that had a clue of what was happening. We walked up to the elevator together and they held hands while I walked a little behind them, he touched her pussy one last time as he kissed her in the elevator and we parted ways to our apartments. My girlfriend was too sore to do anything and I had already cum four times while she was on her date so we didn’t get to play after, but she did tell me about having him cum in her mouth before they got to the restaurant, and some other spicy details about their conversation and future plans. We did not really establish any rules, it was one of those things where we just wanted to have fun and see where it went. I’m so happy she enjoyed it so much, I fucked her this morning before work and she told me she was fantasizing about last night the entire time. I can’t wait until she goes on more dates with this guy and hopefully finds new ones.