Prompt: Lily (as a baby) will only be calmed down by Seb

Sebastian heard the baby wailing as soon as he stepped off the elevator and approached the apartment door. It was loud and unrelenting, and for a second he considered turning back and leaving. He wasn't a fan of babies. He definitely wasn't a fan of crying babies.

But he'd promised Kurt he'd come over. It was November, the weather dreadful and flu season in full swing, so they didn't venture out too much with their three-month-old. Blaine at least had school, but Kurt was slowly going crazy, cooped up in the apartment most of the time. Not that he didn't enjoy being a stay at home dad, but he missed having people around and going out whenever they felt like it.

With a heavy sigh, Sebastian knocked on the door.

"Oh, thank god you're here." Kurt looked frazzled and exhausted as he opened the door with Lily on his shoulder. "She's having a bad day, I can't get her to stop crying and I really need someone to take her over for a second."

"Nu-uh," Sebastian protested as he trailed to the bathroom to wash his hands. "I've told you a hundred times, I'm not babysitting until she talks properly and uses the toilet on her own. Where's Blaine, anyway?"

"I sent him to take a nap, he's been up with her since 4 a.m. I'm not asking you to babysit, Seb, I just need five minutes to pee and grab a quick coffee. Come on, she won't bite you." Kurt navigated him towards the kitchen chair and before Sebastian knew it, his arms were full of a fussy baby. Kurt stretched with a moan of relief and kissed Lily's forehead. "See, just hold her like this. Five minutes, I promise."

And then he was gone, the bathroom door closing behind him, and Sebastian sat there, afraid to move. Babies were so... breakable. Not to mention, wiggly. He frowned when Lily let out a particularly loud mewl.

"Okay, girl, what exactly is your problem?" he asked conversationally and the baby froze with her little mouth comically open. She looked as if she was pondering, her bright blue eyes wide, and Sebastian chuckled quietly. It was kind of cute, he had to admit. "You know, those two love you like crazy, but you've got to let them rest sometimes. Otherwise you'll get them exhausted and useless way too fast. It's strategically unwise, princess."

She smiled suddenly, wide and toothless, and then waved her chubby fist with a squeal of delight. Already all trace of the previous misery was gone from her face.

"How did you do that?" Kurt was standing in the doorway, a picture of astonishment. "We've tried everything all day, both me and Blaine, and nothing helped."

Sebastian shrugged. "I think she likes me. Do you think it's possible she has good taste so early on?"

Kurt laughed and busied himself making coffee. It was the first time Sebastian had seen him using the instant kind.

"I know. But it saves time," Kurt shrugged when he noticed him cringe. "Okay, done. I can take her now if you bring the coffee and whatever you want for yourself to the living room."

"Nah, it's fine." Sebastian was surprised to hear himself say. "I'll be an awesome friend and let you have your coffee in peace. Just pour me some juice."

Getting up and walking with the baby in his arms was still mildly terrifying, but at least Lily was calm now, snuggled comfortably against his chest and gurgling something to herself. By the time he and Kurt were ten minutes into discussing the newest developments of an LGBT-related case Sebastian has taken pro bono, he pretty much forgot there was anything out of the ordinary happening. But then Kurt broke off in the middle of a sentence, his jaw dropping.

"She's asleep." He said softly, his face full of wonder.

She was – tiny fist pressed into her mouth, long lashes fanning over round cheeks, and suddenly Sebastian felt like some kind of hero, even though he didn't really do much of anything.

"Now what?"

"Could you carry her to the bedroom and put her on the bed next to Blaine? When she's fussy like this, she needs plenty of contact, so this way she may sleep longer."

"Sure." Careful not to jostle the baby, Sebastian got up and Kurt went ahead to open the bedroom door for him. Blaine was curled on the wide bed, fast asleep, but the moment Lily was laid next to him, he moved closer to cuddle her up. They looked ridiculously adorable together, asleep like that.

Sebastian left the bedroom and quietly closed the door. Kurt was already in the kitchen, grabbing snacks and making proper coffee. As he went to join him, Sebastian grinned to himself. Maybe babies weren't that bad after all.

Or maybe he was just an awesome uncle.