Love at first sight

How could the great genius Spencer Reid, with three PhDs, an eidetic memory and a higher than average IQ recognize and explain that feeling when he sees that girl every Sunday he goes to a themed coffee shop, full of books, artificial plants and the smell of strong coffee.

Every time he sees her come in, with a briefcase with pins and her smile, he always sits in a corner and pulls out his computer, or sometimes reads a little.

Today was one of those days when he had just finished a case and was completely exhausted, he enters the cafeteria and asks for a coffee while he goes to the library to check out a quantum physics book, then he sees her, in that same section trying to reach a book. He walks over and puts the book down for her “here you go...” when they look at each other so close he can't help himself. She is even prettier up close.