After the train, it had been a long, but wonderful day, and Aster was glad for the nap he and Jude had taken. The boat to the island, the island itself, meeting Jude's parents - it had all been a whirlwind rest of the day. And at long last it had been time to say goodnight, and Aster had been shown to his room, and that's where he was, now.
Remembering Jude's promise to him, and the things he himself had said, Aster was definitely aroused by that point. It had started with a hand down his pajama pants, and then those had been disposed of as he lay under the covers, just touching himself, watching the door and waiting for Jude.