Theo waited until Greg had cloaked himself and then cast a quick and subtle warming charm, belying the need for a cloak (although there were a lot of arguments that the warmth a cloak gave was one that penetrated deeper than the magical warmth of a charm, but Theo wasn't really thinking about those arguments just now).
He inclined his head a little in agreement with Greg's wishes and opened one of the huge double doors, allowing Greg out first. "I will ask my father for permission to accept."