After getting back from prison, Spencer had turned hostile. He ignored his team, pushed them away when he desperately needed the help and support. He was a different man, a changed man. He was no longer the stumbling, awkward Dr. Reid they knew.
So, when Emily told the team a new member was joining after Stephen's unfortunate death, he didn't expect a bundle of joy. A smart, pretty, sweet agent who was constantly trying to cheer them up.
He was expecting himself to hate you, to be annoyed at your constant jokes and attempts to prove yourself to the team. But he didn't. He felt an urge to protect you, to shield you from the dangers of the cruel world even though you too were an FBI agent.
Today, you offered to buy the team coffee. You got everyone's order right, except Spencer's. But he couldn't bring himself to complain, he liked the unfamiliar taste of vanilla on his tongue.
"It's-- it's perfect. Don't worry." He shook his head at your worries.