Noctis had been expecting to end up alone in his cold bed when they returned to the house, that Zoro would go off and be with Sanji, so the weredragon was surprised when Zoro herded him towards the pair's room. He protested but it was clear the werewolf wasn't going to take no as an answer and Noctis ended up in bed with Sanji and Zoro.
Noctis instantly liked the much larger and warmer bed better. He found a spot curled up against Sanji's side and through out the hours that they slept the weredragon slowly stole the covers. By the time the sun was rising Noctis had practically made a nest all to himself, but his face was buried against Sanji's chest, and if you listen closely enough the dragon was purring.