"What can happen in a second"
Sometimes it can happen after years of knowing someone, their flaws, and their quirks. Sometimes it can happen the first time you meet. It's like putting a piece of a puzzle into place. It only takes a second, a second full of certainty, of realization. It only takes a second to realize that all you wanted has been right beside you. It only takes a second to know that you want to spend the next seconds with them until the seconds turn to minutes, hours turn to days.
It only takes a second, like flipping a light switch, when light floods your heart and soul.
A second, just one. That is all it takes, and then you know...
you're in love.