<human>: Can you give me the gist of the text in a nutshell?

This just happened to me last night... It involves a huge cake and some prostitution

I was visiting Paris with my girlfriend (we're still here and it's our last day today). After a night full of steamy sex, we decide to walk around and sight-see, at which point I turn to my girlfriend and tell her to wear a short skirt. I leaned in and whispered to her ear "I wanna fuck you in public... Don't put on any underwear...". 

So that's the back story. What happened next is... Just read on...

We're walking around some park and I start groping her next to a tree. It's obvious everyone could see us, but fuck it. We were horny. I'm getting closer and closer to the insides of her thighs. I let out her left breast and fondle it while my fingers slowly trace the edges of her pussy, now dripping wet; yearning for my cock. I unzip my pants and start teasing her cunt with my dick. Rubbing it up and down, an inch away from going in. It was hot, and I was just about ready to fuck her in that park. But then we spot a kid right next to us carrying a huge cake in his hand. He was alone and probably didn't know what was going on, so I stopped for a second. I looked at the kid and asked him what he was doing with a cake in his hands, and the kid then asked me with a dead-pan face *how much did she cost?* I'm pissed as fuck at this kid right now for dissing me and my girlfriend like that. I turn my entire body towards him now, look him straight in the face and say, "bout tree-fiddy". Turns out my girlfriend is actually the Lochness Monster. Doesn't matter. Had sex.
<bot>: Was having sex with my then girlfriend in public. Kid comes up to us and calls her a prostitute. Shit ensues.