My girlfriend gave me one of the best birthday surprises ever, a threesome with another girl

I’m a humble and straight forward kind of guy. There’s not much I want from my girlfriend on my birthday except for her to treat me right and show me a good time. Fuck me, suck me off, it all counts. But she’s about to make my birthday extra special this year in a way that I could never have imagined. She starts it off the standard way by taking off her clothes and putting on a short strip show for me before sucking me off as well. But what came as a surprise was this huge birthday gift box that opened on its own! Well, it didn’t open on its own, and instead, a beautiful ebony chick came jumping out, ready for action in her black lingerie. I don’t think that anything else would’ve made my birthday better at this point as the girls both started sucking on my cock at the same time. I swear I’ve never felt so much pleasure in my whole entire life. The sluts took turns as one of them sucked on my cock and the other one licked my balls. They really liked to switch it up and soon enough it was time for me to start fucking. I started slamming my cock inside my girlfriend until I saw that she was horny enough so that I knew I had permission to start fucking the ebony chick as well. I took her from behind too and started fucking her black pussy. It was the first time my girlfriend ever watched me fucking another woman and it looked like she liked it! What started as an innocent birthday surprise devolved into an energetic fuck-fest. I enjoyed myself a lot and I ended up fucking the girls both like they were the biggest sluts on planet earth. They seemed to enjoy it too since the more I fucked them, the more they wanted me both inside of them, fucking them as hard as I can.