My Coworker Shared Me With Her Friends

I was a slut most of my life and regularly made moves on some of the other girls I knew. When I became an adult and started working, I didn't hesitate to make a move on my bosses or coworkers. One time, me and this girl were alone in the store after closing, and we had been flirting all day, so I made a comment about her sitting on my lap which she did.
I started stroking her legs, then her hips, then started kissing her neck (easy because she had a pixie cut) and started fondling her tits with one hand while fingering her with another. Then, she pulled me to my feet, pushed me against the wall, and kissed me while fingering me while I grabbed handfuls of the best ass I've ever had the pleasure of grabbing. Even better was that she was wearing yoga pants. Yes, she was wearing yoga pants at work, so I assumed she was planning on making a move on me? Idk. After that, I ate her out, we closed the store, and fucked in my car.
This continued for weeks. Some times we would fuck at work or settle for light groping and making out in the back. I had my own place and fucked her senseless every day we were free, and she would often stay over. I wouldn't say we were dating, but oh well.
Then, she wanted me to meet her friends and hang out with her. I agree and we go to this old house in the more dangerous part of town where I met her friends, these two tall gorgeous black girls, one with a weave and one with giant tits. The one girl's mom went out to work, so we started drinking and smoking, and while my girlfriend and I were snuggling on the couch, her friends were dancing and grinding against one another.
I was staring. My girlfriend knew it, and she started fondling my tits while I watched. When her friends saw, she took my top off and started showing me off to them, and while I was kind of nervous with this being the first time I met them, I wasn't really surprised things went this way. My girlfriend was pretty sexually open herself, even if she didn't seek out sex like I did.
She offered me up to her friends and I was pulled to my feet so they could run their hands all over my legs, pin my hands behind my back, strip my clothes off, suck my tits, smack my ass, and overall fuck me senseless. There was even a strapon involved. I was pinned down with my arms above my head while the girl with the weave fucked my brains out, and the big tit girl was sucking my tits, eventually moving to sit on my face. This continued for awhile until my girlfriend quit her job and moved.