When morning came along, Sebastian felt tired and sore, like he just woke up from a horrible nightmare. It all just felt surreal, but the reality of it all hit him soon enough when he opened his eyes and saw Blaine curled up next to him.

Even though he was still asleep, Sebastian felt him breathing harsh and slightly shaking. When Blaine finally opened his eyes and noticed the position he was in, he slowly untangled himself from Sebastian's embrace, a light blush appearing on his cheeks and clearly feeling self conscious and embarrassed, probably remembering everything that happened the night before.

He looked uncomfortable and shaky, and Sebastian knew they had no chance to be coy about things right now; they needed to talk and figure out how they were going to do this.

And so they did.

No matter how much Sebastian insisted, Blaine refused to check into a clinic, so they agreed to try to do this by themselves. Blaine promised Sebastian that he wouldn't buy any more cocaine and that they'd see each other every day. Sebastian had him on a short leash; the deal was that Blaine would always answer the phone when he called. If Blaine ever tried to isolate himself or disappear, Sebastian would immediately call Cooper and tell him everything.

But it was hard; in fact it was harder than Sebastian ever thought it would be. He expected that going through withdrawal was going to be difficult for Blaine, painful, even. But he never would have imagined it would have such a deep effect on him as well.

Going through this with Blaine was a test to his patience, and his character. He'd never felt so helpless before. No matter how much he read about it online, nothing could really prepare him for the roller coaster of emotions and challenges that helping Blaine detox brought.

The first 2 days Blaine was jumpy, anxious, and extremely irritable. The cravings were really bad, and Sebastian tried his best to be around as much as he could, trying to keep Blaine focused and motivated. He knew it was dangerous to just quit everything at once, so he allowed Blaine to at least have a beer once, to try and calm him down when the cravings had him going nuts. But he could only have a beer with the condition that he also had something to eat. Which he didn't really want to, but Sebastian was stubborn and always made sure Blaine ate at least 3 meals a day.

The third day was when Sebastian started getting really worried though. Blaine was like a ghost, a shadow of his former self. He was quiet and withdrawn, he didn't want to eat, or even leave the bed. Whenever Sebastian coaxed him to interact, Blaine would end up crying.

Sebastian didn't need a formal diagnosis to know that Blaine was depressed. His nights were restless and his days somber, it felt like without the drugs, Blaine had lost the will to live.

Sebastian was lucky to be done with the semester, because otherwise it would have been impossible for him to keep an eye on Blaine like he needed. Also, with the amount of time and effort he needed to put into looking after Blaine, it would have been impossible for him to concentrate on schoolwork.

They alternated between staying at his place some days and others going back to Blaine's.

He never left Blaine alone, except for the time he needed to be at work every afternoon. Those were the longest hours of his day, constantly wondering what Blaine was doing, hoping he wouldn't relapse.

The afternoon of the 8th day, Sebastian called Blaine from work, as he normally would, to check up on him. He called once and Blaine didn't pick up. Sebastian could feel dread growing inside him; he tried dialing one more time before jumping into conclusions and panicking, but Blaine didn't pick up either. He checked on Skype but Blaine wasn't online. Something was definitely wrong.

He still had one more hour to go before he could leave, and he debated for a moment if he should wait or ask to leave early. After his third call went to voicemail, he knew he had to leave.

Sebastian rushed to Blaine's apartment, and in his way up the stairs bumped into some guy who didn't even excuse himself for shoving him away. Not that Sebastian cared though; the only thing on his mind was finding Blaine.

Once Sebastian opened the door he felt his stomach drop to his feet, he could see Blaine was in the balcony with the glass door closed behind him, siting over the railing. He rushed towards him and slowly opened the door, approaching him carefully.

"Blaine..." Sebastian spoke cautiously.

"Don't come any closer!" Blaine pleaded, and Sebastian could tell he'd been crying.

"Blaine please, don't do this..."

"Why not?" Blaine said bitterly, "I'm just scum... I'd be doing you a favor."

Sebastian felt his heartbeat faster and faster. He looked down at Blaine's hands and noticed he was holding a small plastic bag with white powder on it. Shit. Had he taken any? Was he high right now? Was that why he was sitting on the railing? He didn't even want to know; all he wanted to do was take him off the railing and back inside.

"Blaine please..." He tried again, "please just come down. You don't wanna do this."

"Actually, I really want to do it." Blaine said bluntly, "I could just jump, and be done with it."

Sebastian's eyes were wide as Blaine took one of his hands off the railing. He took the small plastic bag and stared at it.

"I just can't do this anymore Sebastian, I don't want to. I promised you I wouldn't buy again and I did. I'll never be able to stop, I might as well just die."

Sebastian was slowly getting closer to Blaine, careful not to startle him, he knew he had to be quick, he couldn't let Blaine sit there for another second, he was not going to let him jump. And so Sebastian threw himself at Blaine, curling his arms around his waist, pulling him off the railing and back into the balcony. The move was sudden and harsh, and they both hit their heads against the wall when they fell back.

Blaine started trying to wrestle Sebastian off of him, but Sebastian's grip was firm and strong, holding him down. Sebastian couldn't even say anything as Blaine kicked and thrashed beneath him, he just felt despair overcoming him, thinking about how if he hadn't left the office early, Blaine could be dead. Thinking about how he probably would end up dying anyways and Sebastian wouldn't be able to do anything about it.

Blaine gasped and whined under Sebastian, wishing he could just get him off. It wasn't until he felt wetness drop on him from above that he finally stopped fighting. In the midst of his desperation he hadn't realized Sebastian was crying, tears were streaming down his face and dripping from his chin and onto Blaine.

Blaine froze, shocked and ashamed all at the same time. And in that moment he felt whichever little strength he still had just drain away from him as he started crying too.

Blaine wanted to die; he just wanted everything to end. He'd known this was going to happen, he wasn't strong enough to quit. He wasn't even strong enough to kill himself. He'd tried before, Sebastian didn't know that, but he had.

Blaine didn't care about his life anymore, he was already dead inside anyway. But somehow watching Sebastian cry because of him just tore him in a place he didn't even know he could hurt. He didn't want to fight anymore, didn't want to hurt, and didn't want to feel. He just wanted it all to stop.

Once Sebastian sensed Blaine was no longer fighting him, his grip on Blaine's wrists softened. They'd both been crying for what seemed like hours, not saying anything.

"I'm so sorry, Seb..." Blaine said, sniffling as he slowly pulled himself up into a sitting position.

Sebastian didn't say anything; he just looked to the side as he wiped the tears and snot from his face with the sleeve of his shirt.

"You can't do that Blaine..." He said, voice hoarse from all the crying, "You can't kill yourself Blaine, you can't do that to me."

Sebastian words cut deep into him, and Blaine realized in that moment how selfish he had been. He'd been going through hell but all the while, Sebastian had stood by his side. Sebastian had been with I'm every step of the way, staying awake during his sleepless nights, talking to him even when he was not talking back, supporting him, believing in him, and Blaine had just been taking that for granted.

Sebastian didn't deserve this; he didn't deserve to be stuck with this broken, drug-addicted shell of a person. But somehow, as Sebastian leaned forward and put his arms around him in a tight embrace, Blaine realized that Sebastian cared about him, he truly cared about him.

They hugged tightly, sitting on the floor, sobbing into each other's shoulders and whispering promises. Blaine knew he had to get better; he had to stop himself from spiraling back into his addiction. Even if not for him, he had to do it for Sebastian.

So after that day, Blaine finally agreed to check himself into a clinic. It was the hardest thing he'd ever had to do, but he did it. The hopeful gleam in Sebastian's eyes when he told him was enough to give him the courage to call Cooper and tell him everything. After all, Cooper had been the only one who knew about Blaine's depression a few years back, and he'd been there for him when he went to therapy and started taking antidepressants on his first year of college.

Cooper didn't judge him back then, and he didn't judge him this time either, he even promised not to tell their mother, as long as Blaine stayed in rehab for the 30 day minimum they instructed, and stuck to the treatment and outpatient care afterwards too.

After 2 months, Blaine was slowly getting back to normal, and even though it was hard, he even joined a 12-step program. He agreed to everything as long as it meant he could get better and stay on track.

Every step of the way, Sebastian was there for him. Blaine never understood what Sebastian saw in him that made him stay. He never could have imagined that that reckless, overtly flirtatious and scheming boy he met back in high school would become his rock, the one person keeping him grounded in the midst of the mess that had become of his life.

Sometimes Blaine wondered what would have happened if they hadn't bumped into each other in the subway all those months ago. Looking back, he knows his life would be different, would be worse. But that spark of friendship they ignited that day had been the light that brought Blaine back to life.

Blaine hugged Sebastian tightly as he felt the touch of his lips kissing his forehead and smiled. He'd been clean for 6 months now, and Sebastian had taken him out for dinner to celebrate. Now they were back at Sebastian's apartment, lying in the couch, watching TV.

Sebastian stared blankly at the television, not really paying attention to whatever movie was playing. For a moment he was just lost in the feeling of Blaine curled up next to him, the sound of his breathing and the heat of his body pressed to his side. He saw how Blaine smiled and his lips curled up into a smile of his own. He still couldn't believe Blaine was doing so much better.

Six months seemed like an eternity, but he'd made it through. Addiction was a complicated thing, and he knew he couldn't take any progress Blaine made for granted.

As bad as everything was, Sebastian was glad he was able to be with Blaine through it all. It made them bond together in a way he never imagined he could. After everything that happened, Sebastian realized he needed Blaine as much as Blaine needed him.

Whichever arguments they got into or differences they had paled in comparison to what they went through while Blaine was going through detox and rehab respectively. It had been hard for Sebastian at first, his feelings for Blaine confused him and while they had blurred the lines between just friends and something more, they hadn't "officially" gotten together until 2 months ago.

It was like everything had finally fallen into place. Blaine was so much more than just his boyfriend; they were more than just best friends who happened to be together.

Sebastian was certain he would never get used to the feeling of Blaine's skin against his own, of their mouths connected together and their bodies moving in sync. He'd been with plenty of people before, but sex had never felt like it did with Blaine.

Now, as they kissed lazily on the couch, with Blaine's legs wrapped around his waist and his fingers running though Sebastian's hair, he knows exactly why. Blaine and him have a connection that goes further than just the physical, they didn't just want each other, didn't just like each other, they needed and complemented each other.

As they slowly undress each other, kissing and worshipping every inch of skin exposed, Sebastian knows this is real, and revels in the magic of it. He looks deep into amber eyes, glowing as they look up at him, lips red from all the kissing, skin flush with arousal and feels a warm feeling spread within his chest. Sebastian then leaned down to kiss Blaine's neck, slowly trailing up to his jaw before landing softly in his lips and whispered 'I love you'.

He feels Blaine's breath hitch and even with his eyes closed, Sebastian can feel him smiling into the kiss. "I love you so, so much." He hears Blaine whisper back as their mouths continue to move together along with the rest of their bodies.

Later that night, as they lay curled around each other under the covers, their bodies warm and sated, Sebastian finally knows for sure, this is what being in love feels like.

Author's note: Thank you so much for reading! This was my first time writing Seblaine, and I loved it. Any feedback and reviews are much appreciated.

Thanks to the OP for a very interesting prompt, I hope you liked my fill.