My first Theesome

I'd been flirting with Clare for a while in work. I always thought she would be one of the girls that would play around in work, but never actually go through with anything. It was a slow day in work and as usual the subject came round to sex. We were having a cheeky conversation about fetishes and she was telling me about how she'd had the threesome with her husband and another guy. Making sex faces while saying she loved getting it in both holes at the same time. I wasn't sure if she was lying or just brazen. I joked that I wish we hadn't worked together and then maybe I could have got some of that action. She agreed and said it was a shame.
Two weeks later, we were on a works do and after the fourth pub people were starting to show the signs of being a little worse for wear. All of a sudden two of the girls started fighting. It was all over very quickly, but it had destroyed the atmosphere and most of the people out either wanted to go their separate ways or go home.
Clare turned to me and said, "you're not going, are you?"
I was having a good time and fancied a few more drinks so I said, "you're not getting rid of me that easy!"
I went to the bar and got a couple more drinks with tequila chasers. When I got back with the drinks Clare was saying about the astronomical cost of drinks. It was pricey, but nothing too bad and I pointed out that she was making a fuss over nothing when she hit me with, "let's finish these and go back to mine. I've got a fridge full of stuff to drink and it'd already paid for."
I could see she had a mischievous look on her face and didn't know where she was going with it.
I was up front and asked the question, “Why? If you're thinking what I think you are, this probably isn't a good idea”.
She looked all scorned and scowled at me, “get over yourself! I'm offering you a free drink, you idiot!”
I felt like a total asshole. I apologised and she instantly brightened and told me it didn't matter, but the drink was still on offer. I didn't really have choice. I felt so guilty.