I am so, so sorry that this is incredibly late due to exams and things!
It would be a bad idea to talk about how they had landed up in the massive freezer, and even though Draco knew it was completely his fault he was not about to admit this to Hermione Granger anytime soon. Disapparating from inside seemed to be pointless; there was some sort of magic holding them within. Surely, though, someone would end up finding them in the end. Draco was confident of it; Hermione, not so much. She was also finding it productive to carry on lecturing him about stupidity, ego, etc etc. Finally the Malfoy couldn't stand it any longer- it was bad enough being stuck here without their wands or any other things that could possibly get them out, and the idiot Gryffindor had to keep going on about it.
"By Salazar, Granger, do shut up."
Hermione glared at him full-force. "If it wasn't for you-"
"You wouldn't be here, yes." Draco sighed heavily. "Why don't you use that brain of yours to find some way for us to stay warm or get out of here instead?"
His companion frowned, seeing the wisdom in the suggestion. There was a blessed silence for a minute, before she spoke up again. "There is a good way- a tried and tested one- to conserve warmth, you know- it works on the principles of-"
"Save it, Granger, what is it?" Draco stammered out as brashly as he could- not very, since his teeth were beginning to chatter from the effects of the cold.
"Sharing body heat. People do it especially in large groups; huddling together so they won't lose heat easily." She gave him a meaningful look. "If you want to, we can do that. It'll keep us warmer for longer."
Draco blanched. Essentially it was cuddling. Cuddling. With the Gryffindor. With the Mudblood! Okay, perhaps he liked her. A little. Sort of. No, he didn't, not really, I mean, he was a Slytherin. Slytherins were at war with Gryffindors. Right? He squirmed uncomfortably, staring at Hermione. Then again, it was for the sake of self-preservation. He was beginning to feel numb to the bone, even tucked under his thick robes; if frostbite set it that was the end of them. It might be a good idea.
"OK," He agreed reluctantly, sidling over to her. "Good idea."
He had to admit it was a nice feeling, even making him feel a little warmer on the inside. He even dared to put an arm around Hermione under their coats after a while. He could get used to this- just maybe without the gelid environment.
And then she fell asleep on his shoulder, and things got a teensy bit more awkward.
Especially when they were found ten minutes after that, and when the door was wrenched open, the first thing Draco quickly yelled was "it's not what it looks like!"
Even after all this time, Draco gets skittish whenever he's vulnerable. The last time someone crept up behind him intending to give him a fright, he broke the poor kid's finger's after turning around at the first touch of hand on shoulder and bending said hand backwards to defend himself. It's something he's developed after the War, being left to re-establish the Malfoy name after the atrocities committed under Voldemort's rule. The whispers, stares, the constant gossip he's been surrounded by... it's just made him incredibly wary. So when he hears footsteps behind him while he's working on some high-level Herbology stuff, his first reaction is to grab his wand and turn around at lightning speed, mouth open to cast Petrificus Totalus if needed.
Neville stands there calmly, never batting an eyelid. The blond-haired young man breathes a long sigh of relief, replacing his wand where it should be. "Don't sneak up on me like that."
"Your door was open, I walked in," Neville points out mildly, smiling as he approaches Draco. "How is it going?"
Draco grunts, frustrated. "You're the Herbology professor; can't you help?"
"That's why I came in. You might find this beneficial." He fishes a packet of seeds out of his pocket and hands it to Draco, who raises an eyebrow. "These are Muggle plant seeds. What am I supposed to do with them?"
Neville grins playfully. "Okay, so maybe they're not very relevant... but you'll like what you see when you open it."
Arching an eyebrow, Draco rips the packet open and unceremoniously dumps its contents onto the table. For a moment his eye sweeps over the seeds, unimpressed, and then his breath catches.
"Indeed. Pretty creative approach, don't you think?" Neville plucks the slightly ostentatious ring from the pile of seeds. "I was going to just put these as a bookmark in your Herbology texts but I thought you might throw them away."
Draco smiles affectionately, face softening as Neville places the ring on his finger without much ceremony; they both know what it means. "You know me too well."
Neville nods, agreeing. "I do. And for that I'm spending the rest of my life with you."