You. Ever since you joined the BAU, Spencer felt like he was going insane. The first time he saw you, he felt his knees a little bit weak because you were stunning — and as the months went by, it didn't help that you revealed yourself to be sweet, gentle, and an amazing profiler.
After Maeve and her death, Spencer Reid thought he'd never feel such strong romantic feelings and physical attraction to someone, but, hell, you showed up out of nowhere in the middle of his trauma and work, three months later he had managed to get out of jail (since he was in prison for a crime he didn't commit and the BAU managed to prove it) and a lot of years laters he had lost a woman he loved. He wasn't expecting anything close to this, and yet... I'm in love, I'm in deep, hypnotized, I'm shakin' to my knees.
Every time you were around him, every morning you walked into the bullpen and gave him coffee — and he always felt flushed by the fact you remember his order perfectly well — it felt like magical mysteria. Spencer wanted to touch you, to hug you, to kiss you.
But were you into his reach? Were you into him? Yes, of course you were, but Spencer Reid didn't know it — he wasn't the best with social cues. Tonight, outside the BAU, was raining cats and dogs — and you hadn't drove to work. So you figured you could call an Uber, or... Ask Spencer to drive you, since he was the only one left of the team now.
You walked to his desk, all stunning, and Spencer's hazel eyes fell on you. He couldn't look away.
Hysteria when you're near.