Can't survive. Oh. Oh. Alec honestly thought that he would die if he had sex with Magnus.

Which was a possibility, if Magnus wanted it to be. If Alec were with any other incubus, it would practically be a given. But it didn't have to be that way. It didn't have to end so terribly. It was only the demonic impulses that made it so.

And Alec was doing a good job of taking Magnus' impulses and turning them on their head.

"I doesn't have to be like that." He licks a stripe up Alec's neck, then pulls away enough to rest their foreheads together. Magnus is breathing hard.

"I just need-- I just need your energy. Not your life."