[21M] how I entered a brief open relationship

I have another story on this from events more recent than this if you are interested in reading (but I’ll tell you now, nothing else transpired from this later experience besides what I posted). Here is the link: https://www.reddit.com/r/gonewildstories/comments/50onz1/21m_a_return_to_voyeurism_and_some_cuck/

A year ago in September of 2015, my girlfriend had only a few months living in North Texas with me and knew no one except for a handful of my relatives and me. At the beginning of September, she met a friend and neighbor who is tall, blonde hair, blue eyes, and skinny. I have no idea how they met but I did tell each of them about the other casually for months on end. The following paragraph may be a bit sketchy as it is around my girlfriend’s and friend’s recollections from what they told me.

21M A return to voyeurism and some cuck

A year ago, my girlfriend was having an affair with a close friend and neighbor of mine named Craig. I introduced them to each other around this time of September and behind my back would flirt with each other and tease each other until they had sex after 3 weeks of flirting and hanging out. The next day after they fucked, my friend confessed everything to me out of guilt while my girlfriend did her best to hide it in shame. I took advantage of the situation and had her on speaker phone, while my friend was with me, and forced them to give me the details as they cried of humiliation. The next day after the confession, I spoke to them both in person and we began an open relationship where they began to fuck on the spot for a month, but this whole affair is a story for another time. What I really wanted to post about today was what happened last night!