Alec said he was special. The idea of anyone actually thinking he was special made his heart beat faster. And he was saying this to his brother, his family. Sebastian knew Jack had felt the same about him, but hearing Alec say it meant so much to him. He didn't think he was special in any way that truly mattered, but Alec thought he was and that was all that mattered.

"I can see that." Jace smirked faintly, but didn't say anything further.

The comment reminded Sebastian they had an audience, he had forgotten for a moment Jace was right there because he couldn't stop staring at Alec and imagining their first date. "We could talk about it more when you come get Chairman Meow." He offered.