After getting the Patronus, Remus left the school and cancelled the rest of his classes for the day. While it may have been just this side of irresponsible to run off as he did, there was no way in hell he was going to let Dora be by herself.
In the back of his mind, he was thankful they had run off and gotten married. It just seemed... easier to justify him running off -- at least to himself.
The only way to describe the speed with which Remus arrived at their home was 'hauling ass to get there'. Panting, half out of breath, mostly out of worry for Dora, Remus managed to find her. He was only vaguely aware of Cass' presence, moving to draw Dora into his arms. "Love, what happened?" It was then that he did notice Cass and looked up slightly guiltily. "My apologies for interrupting," he said to Cass, yet did not let go of Dora either.