25M Flirting with my hot co worker — thinking about seriously cheating with anyone now

For context:
I’m 25 and work a corporate finance job in London. My girlfriend and I have only been with each other sexually. I love her, but I just want to fuck other girls now.
My sex drive is through the roof, and I recharge really fast… after one round with her, I’m ready to go again while she’s completely done.

I can make my girlfriend squirt 4 or 5 times in one session, but she never puts in the effort to make me cum. I’m always doing all the work, and she doesn’t even let me take my time with her or go more than once. When I do cum, I have huge loads that just leak out of her, and the thought of that happening with another girl is driving me wild.

I’ve been fantasising about having a side girl… someone who craves being my secret. I want a cute girl who loves my dick and wants to feel me fill her up, especially if she enjoys the thrill of taking my cum away from my girlfriend. The idea of a girl who’s eager to please me and is down for multiple rounds is so exciting…

Ontop of these feelings, a hot girl at work (27, she looks like my gf just brunette) has started flirting with me more and more.
I was trying to show her a photo of something during lunch, and she noticed a photo of me shirtless was there. She said she had no idea I was hiding that, and I kinda moved past it…
We’ve been flirting ever since, but when others aren’t around. I really want to just fuck her until she feels my huge load 😩😩
She has even started asking me to go on lunch more and more

I’d love to have a girl who just wants to be my secret who I creampie…