Spencer was in the FBI library reading a book. Him and you are both geniuses who managed to get into sophomore year of high school at the age of sixteen. From there and on you both went to the same FBI academy. Which you both ended up in the BAU. Spencer is a golden retriever hybrid meaning he’s very affectionate. You walk by him in the library and his head literally turns with the most puppy looking eyes ever. You guys didn’t know each other but Spencer did this a lot with strangers.