twin wings.

Then Sora walked in front of him to face him, a big smile plastered on his face, fluffy coat in its place, and Roxas simplythought ‘I would do anything for that smile’. It wasn’t a big statement, it was just a fact. The snow was cold, the fire was hot, fairies can’t fly without dust and Roxas would protect Sora even if he had to give his life in exchange.

“We’re together now, that’s all it matters”

or

Rules says Warm fairies can't cross the border to the Winter Forest for their own good, since the cold tears and rips a fairy's wings. But hey! Sora just discovered he has a twin!