3sum Gone Wrong

So my wife came out as bi or polyamorous a couple years ago, which led to a long talk and some interesting confessions about stuff she'd like to try when the kids had left home. Some things we worked on crossing of her list and we did some from mine too. Recently we had the chance to spend the night away and went to a local club and my wife ended up picking up a pretty woman still In uni and both wanted a 3sum so we finished our drinks and went back to the hotel. They started making out as soon as we got through the door and were fucking not long after, I was surprised to find out my wife had packed toys for our little trip and they both made good use of them, and I really loved watching them do their thing, after a little while my wife led back to have her new friend Amanda go down on her and told me to do the same to her so I did. Amanda's pussy was dripping wet and tasted sweet, as I worked her little clitt and put my tongue to work she started shaking and came and quite sweetly apologised to us saying it had been a while. She moved her pussy up over my wife's mouth so I started fucking my wife and it didn't take longfor her to cum.
We switched positions and tried everything they wanted then stopped for a bit.
My wife told Amanda to sit back and relax on my lapwhich she did happily and with how my dick was and how wet she was it just slid on in and she let out a little whimper. Huge boost to my ego she said she hadn't had a real dick in her as big as mine before so I was very happy with our new friend.
My wife realised my joy at this and started licking Amanda's pussy which made her start grinding down on me, within 10 15 minutes I was ready to pop and went to lift Amanda off my dick. My wife however said no and worked Amanda's pussy more making her go fell orgasm, and beg me to cum. I was powerless to deny them this and emptied my balls deep in her. My wife didn't miss a beat and as soon as my balls were empty she sucked me clean and started lapping my cum out of Amanda's pussy.
We got cleaned up and all got into bed Amanda between us, during the night I jeard them play with each others pussys till they came, got woke up to my wife sucking my dick then getting me to fill her pussy and finally 1 last time Amanda rubbing her ass on me to get me hard then getting me in her pussyand making me cum.
In the morning my wife and Amanda showered together while having a quick session and Amanda left.
They kept in contact after texting and calling each other and I was recently informed by my wife that she's really sorry but because of what she did I'm gonna be a dad again, I thought she meant her but turns out she means Amanda. So that was a surprise.
My wife has taken the news better than me, even bigger surprise is that my wife wants Amanda to visit us on a regular basis for more sex and Amanda's fine with this.
I'm finding it all a bit much, love 3sums don't get me wrong but they're not meant to end like this.