Discovering my sexuality through a QP-throuple
I'm not really into queer community or discourse and have just started to discover my sexuality.
So I (19M) am kinda asexual and I met this girl in high school, let's call her Bonnie. I met her in high school and we quickly became friends, growing closer and closer. One day she told me that she had a crush on me, but I rejected her. We still stayed friends and about a year and a half later, we were regularly talking about each others emotions and basically spend our entire days together, in and after school. We were best friends, fully platonic. At around that time, a girl, let's call her Phoebe, starting texting with Bonnie over Reddit at first. They started texting a lot with each other, confessing their love to each other a few weeks later. They'd soon after meet irl, which wasn't easy cause it was a 9h+ ride by car.
Whenever they met though, I hang out with them in vc on most days and would sometimes barely hear or understand things they were doing to each other while being in vc with me.
Bonnie also invited Phoebe to our dc server and from then on, all three of us always hang out together. At first, Phoebe was really uncomfortable around me and rarely even talked to me. But as weeks passed, she got more comfortable with me, and we eventually became pretty close friends. So I was really close with both of them, while they were together. Phoebe eventually started to talk about sexual things she and Bonnie did pretty openly, which made me kinda uncomfortable in the beginning, but as time passed, I got more and more comfortable with it. After they were together for a little more then half a year, they broke up, but our trio survived and we all stayed friends. Shortly after graduating from high school, we decided to all meet at Phoebe's place. There was only one bed in the room, but it was really wide so we all slept in it together. We all were really close and comfortable around the others, so Bonnie and Phoebe decided that they want to sleep naked as it's more comfortable. We all had pretty platonic relationships with each other though, and cuddled a lot, but never really in a sexual way. Bonnie and Phoebe still made out sometimes though and didn't have a problem doing so in front of me while both were lying in the bed naked.
On the last day at Phoebe's place we had a little house party, with a few of Phoebe's friends coming over. We watched stupid shows and played a drinking game. Bonnie started at some point to play Hollow Knight and was fully absorbed by it, not really giving a shit about anything else.
Phoebe got overwhelmed soon after and left the house, saying she needed a few minutes of fresh air. Shortly after, she texted me, asking if I want to come outside, as she doesn't want to be alone. As it was the last day and I hadn't seen a lot of her home town, she offered me to show me around a bit. It was like 3 am or something, so the streets were empty and it was dark, but she showed me around a bit, while we were holding hands. When we arrived at her former school, we started making out, which was actually my first kiss (as I said I'm kinda asexual, maybe greysexual?). That led up to her giving me head next to a small sports ground.
We told Bonnie about that a few days later and she though it was really funny. From there on things kinda escalated, and our group chat consist of us talking about our deep emotions, sending random memes, talking about shows we watched, followed up with one of them casually sending nudes and all of us talking about our kinks. Phoebe is also kinda my Dom now and regularly embarrassing and humiliating me in front of Bonnie, who's making fun of me for it.
We jokingly made the decision to meet at my place at a specific date for a platonic threesome, but I don't know if it's really a joke.
This is probably some straight guy's biggest fantasy but I'm just kinda standing there confused and I don't really know how I got here. Any thought on how I should handle this?