Happy birthday, Alexander," Magnus murmured.
"Thanks for remembering," Alec whispered back.

Magnus raised his head and looked up and over at Alec; it was a look that made Clary flush and glance away. There was so much love in it, mixed with exasperation and pride and despair. It was an unguarded look, and it felt wrong to see it.

Magnus reached for Alec, but instead of rising to his feet, he pulled Alec against him, his hand sliding up Alec’s back to knot in his hair. Magnus pulled Alec down and against him, and kissed him,hard and awkward and determined, and Alec froze for a moment and then abandoned himself to it, to kissing Magnus, something he’d thought he’d never get to do again. Alec ran his hands up Magnus’s
shoulders to the sides of his neck and cupped his hands there, holding Magnus in place while he kissed him thoroughly breathless.

Where's Magnus?" he said. AS he looked toward the kitchen, Clary saw a bruise on his jaw, below his ear, about the size of a thumbprint.
"Alec!" Magnus came skidding into the living room and blew a kiss to his boyfriend across the room. Having discarded his slippers, he was barefoot now. His cat's eyes shone as he looked at Alec.

The posters bore the words WITH THE PASSING YEARS COMES...IMPOTENCE! Magnus found himself staring at the posters with a sort of absent horror. He looked at Alec and found that Alec could not tear his eyes away either. He wondered if Alec was aware that Magnus was three hundred years old and whether Alec was considering exactly how impotent one might become after that much time.

Instead of replying, Alec reached down and took Magnus's hands. Magnus let Alec pull him to his feet, a questioning look in his eyes. Before he could say anything, Alec drew him closer and kissed him. Magnus made a soft, pleased sound, and gripped the back of Alec's shirt, rucking it up, his fingers cool on Alec's spine. Alec leaned into him, pinning Magnus between the table and his own body. Not that Magnus seemed to mind.
'Come on,' Alec said against Magnus's ear. 'It's late. Let's go to bed.