Prologue: This could work

Sebastian knocked on the door, palms sweaty and- if he were telling the truth- body shaking. He had no idea what was going to happen when they opened the door, but he did know he'd either be heart-broken or have a heart full of love. Either way, it terrified him.

The door opened to reveal an equally nervous Blaine Anderson, "Hey, Seb, come on in."

Inside, found Kurt walking down the stairs of his home, half smiling. The boys had come a long way in just a year. Where once they were always at odds, fighting and screaming at each other, throwing slushies-now they're friends. More than friends actually, more like something bordering on romance. What was once Sebastian interrupting a coffee date, now just automatically includes him. The fighting and outright insulting had not stopped, but gone more to the way-side to turn into flirty banter and sappy compliments. But lately Sebastian had started to pull away, he was more reserved around the boys, beating himself up for falling in love with two boys who were already together

Kurt walked in front of Sebastian and pulled him into a hug, effectively drawing him out of his thoughts. Once they pulled away, they made their way to sit on the couch with Blaine in the middle. "Bastian," Kurt started. "Blaine and I-we-we've noticed that lately you-I mean." He trailed off, so the curly haired boy took over. "We've noticed that you've changed a little, that you've been sadder lately and we just wanted to know if you're ok?"

Sebastian's first reaction was to deny it, scoff and ask why they care. But he couldn't, he couldn't lie to himself and he cared too much about them to pull something out of his ass and push them away. He wanted them too badly for that. "I'm scared. I'm mad. I've always hidden my thoughts and feelings, fucking anything that walks and leaving the next morning. I've never wanted to fall in love, never wanted to do the sleepovers where you fall asleep cuddling and make breakfast-in-bed the next morning. But then, I met you Blaine, and at first he was just supposed to be another conquest, someone to keep me occupied for a little bit and mess with you, Kurt. But then, I got to know the both of you, and all those things that I never wanted I do now. And it terrifies me that I'm falling in love with two people who are already in a relationship, but that's where I am. I love the both of you, and you can either take a chance on me and bring me into this or I can walk out that door and never look back, even though I know that it will kill me to do that." Sebastian ended his monologue noticing that somewhere along the way he started crying.

Kurt and Blaine looked at each other and nodded the taller of the two moving to the other side of the silently crying teen and rubbing his back. "That would kill us too Bas," Kurt started. "I know it's scary to fall in love, but there's also some good about it. Like when the person or people are falling in love with you too." Sebastian looked up at that. "Y-You love me?" He looked at the two boys incredulously. Blaine took the boy's hands, "Of course we do, somewhere along the way your pick up lines and compliments got to us and as much as we love each other, we both agree that bringing you into this would only intensify our relationship." Blaine smiled as he leaned in and kissed Sebastian's cheek.

"It's not going to be easy, having one boyfriend is hard enough, both of you is going to be a handful, but if we work together and talk I think it will work. There will have to be rules, so that we can maybe eliminate the possibility of us getting hurt. If you're willing to be in this that is."

Sebastian nodded and the three of the spent the rest of the day talking about how this was going to work, making rules and discussing things each of them wanted. Later, Burt came home to find the three boys cuddled up on the couch sleeping with a movie playing forgotten in the background. There would be a discussion later, but as he looked at his boy snuggled in the protective arms of Blaine and Sebastian in both of theirs, he knew as long as they were happy he'd support them.