We had sex instead of dating as my girlfriend tried on different outfits

I was supposed to go on a date with my girlfriend, but she had other plans. She wanted to try on different outfits for me. As I was waiting for her, I noticed her friend hanging around. The guy offered me a drink, and we got to talking about dating. He mentioned that his friend was trying on outfits, and I thought it might be interesting. Then he showed me the bedroom, and there she was, wearing one of the outfits. She invited me to join her, and I couldn't resist. We started off with some kissing and foreplay, and soon enough, we were having sex. She gave me a blowjob before riding me in cowgirl position. Then we switched to doggystyle, and I took her from behind. Finally, she bent over and let me fuck her from the front. It was a wild ride, and we both enjoyed it.