[Group] Vacation Swap with my Girlfriend, our Best Friend and her Boyfriend

(Made a new account to post this as my other one has too much personal info.)

My girlfriend (Lucy) and I (Paul) just returned from a Euro-trip with our best friend (Shan) and her boyfriend (Mark). On the trip, the four of us had some fun. I never would have expected this to happen, and the contrasting notions of how natural it felt with the intensity of the acts themselves, turns me on immensely. I hope you, the reader, are turned on as well! Enjoy!

Background:

Lucy and I have been together for a little over 7 years since we met in college. Her and Shan were roommates in their sorority and were best friends. Naturally, as I was over there a lot, the three of us became close. Shan and I had (have) a lot in common separate from my relationship with Lucy, which makes our trio pretty easy going and tight knit. Shan has gone through a number of relationships that Lucy and I have not felt were right for her, but as of two years ago, she started dating Mark and he fit into our group perfectly. Aside from that, he is genuinely good for her and treats her the way she should be treated. The four of us recently took a trip to Europe (Portugal – Spain – France), in part because we’ve always wanted to, but also to celebrate a recent career accomplishment for me.