His eyes went wide as Jace moved, hand slipping away from its spot on his neck, support suddenly vanishing unexpectedly. If they'd been training, he would have anticipated something like that but relaxing in the kitchen, discussing their new landlord had lulled him into not expecting Jace to pull one of his training stunts. Waiting for his head to thunk against the cabinet, he froze when Jace's hand caught at his shirt, keeping him from that minor pain.

Watching Jace physically and mentally move away, he told himself not to feel hurt by the shift. It was normal for them now. Alec had quit being as visibly affectionate after he started dating Magnus and Jace had changed his focus from their friendship to Clary. One moment of parabatai bonding didn't change the fact that their relationship wasn't the same as it'd been.

"I'm not sure. It'd be the easiest way to arrange things. It'd make things less awkward and keep everyone safe if Magnus is tinkering with spells." Not that magic was normal in the bedroom but 'tinkering' was a better description than 'Magnus lost control because I did something kinky with him'. But Jace seemed to not like being alone, away from him, so Alec wasn't sure if that was the best plan for the bedroom arrangement. "But with magic, we could probably rearrange things to how we want them."

He had the feeling that Jace probably shouldn't be too far away no matter how much privacy he and Magnus wanted. "I already signed. And not with blood. Just normal, non-magical ink."