How had this happened, how had everything come to this moment? The moment where he, Harry, was stood under mistletoe with Draco, blushing like a first year with a crush. This was absolutely and irrevocably insane and- wait, let's rewind first.
After the Battle of Hogwarts, people had turned to Harry as if he was the source of all hope, sticking by him as if he was the only thing that could make them survive another day. Harry loved helping people and understood what they were going through, but it got exhausting after a while.
Somehow that had lead to Harry sneaking up to the Astronomy tower late every night and ultimately losing sleep to an unhealthy amount. He'd have been fine with anyone else pointing this out but suddenly it was Draco that followed him up to the Astronomy tower and brought him back to the Gryffindor dorms.
Suddenly it was Draco who was like a silent bodyguard who swooped in whenever the crowds around Harry got too big, complaining about something and getting everyone to disperse like a magical forcefield. Harry was both grateful and extremely confused about it.
That lead to Draco hanging about in their 'trio' more, a silent acceptance between Ron, him and Hermione that Draco was doing more good than bad for Harry and couldn't possibly be the same as he'd been the past seven years.
Fast foward, Draco has been brought onto the Weasley's Winter trip to their cabin in the Alps, after the blonde had decided he didn't really want to go back home. Harry had been fine with it until well, this happened.