Antonin didn't like the idea of his wife being alone with a complete stranger. Especially not after she'd already proven publicly how vulnerable she was. When she suggested her old attic bedroom, her husband wanted to come with them. Only after Mr. Akingbade insisted that it was imperative that they have no distractions did he relent. Alain made his excuses to check on his nephew. Likely he didn't want to spend any longer with his older brother than was absolutely necessary. Not that Hermione could blame him. Theirs wasn't the easiest of relationships to begin with.