Regulus woke up alone, and he should have been used to it. It wasn't like he could have men at his house. He might have been the favourite son, but if he had tried something like that, his parents would have hexed him. However, a few days with Remus had brought back the memories of school, when he dictated law in the Slytherin dormitory and if he wanted to sleep with someone, people knew better than to tell Slughorn. It was so much nicer to wake up with a warm body next to him, which was why he was annoyed. This was the second time already. The first time was the day before and Remus had gone off to see Potter and now-
He had no idea where Remus was. He threw his robe on, leaving it half open and walked barefoot to the other room. He stopped when he saw what Remus was doing. He still didn't like waking up alone, but at least the reason was slight better than Potter.
He observed in silence until the werewolf took shape. "You're taking too much time, thinking too hard. Magic should be instinctive." It was the problem with too much theory.