You were usually more like him. Antisocial and reserved, even though you were practically bursting with hidden talents that you wouldn't dare share. Like singing.
You did your own music as a little hobby. He has seen the balls of scrunched up paper around your house and the little guitar in your closet, but he thought nothing of it. But those papers were lyrics you wrote. And you were just waiting for a chance to show them your musical talent.
You were more confident on your own, and that's not bad. But he just wished you would show it, he just wished you would be yourself and not care what others think. Even if that was a bit hypocritical, he thought you deserved it more than he did.
He didn't think you'd be up for this. You barely spoke to the team, he didn't think that you would be up to singing karaoke in a full bar of people. Never in a million years.
But as the worker on the microphone said "next up is David Rossi" with that cheeky grin on her face and Rossi pulled JJ and Morgan up on the stage with him, you walked up too. This was finally your chance.
As all four of you sang your heart out on that microphone, squished together, Spencer couldn't help but admire you. You were becoming more confident and he knows it's bad to say this, but he's never realized how stunning you were until now.
You were way prettier when you weren't scared of others opinions. It could be said that even a little crush was creeping up on his heart, now that he's watching you finally embrace yourself.