Spencer let Morgan fuck whoever he wanted to. Whenever he wanted to.

From the officer in Miami to the clerk at Morgan's favorite grocery store.

Spencer knew every single time it happened, and if it or when it would happen it again.

At first Derek had insisted he didn't need anyone else, he loved Spencer, he wasn't going to have an affair. But Spencer was after all a genius and he knew the truth.

You see, as much as Derek Morgan loved Spencer, Spencer loved him more. And he understood his lover, every aspect of him.

So he insisted on Derek sleeping with another woman. Spencer knew, historically as well as personally that not one person could really satisfies another person. You could love just one person, but on a basic level…you wanted more.

It started slow at first, Derek being uncomfortable with the concept. Then slowly it changed, Derek would leave work, Spencer would go home. Hours later the older man would appear on his doorstep with a movie and kiss. They'd spend the rest of the night wraps in each other's arms, pointing out mistakes in old movies.

Then? When the women were the last thing on Derek's mind, Spencer pulls him to bed.

Spencer knew he couldn't be everything to Derek. He also knew he'd rather be the one who shared Derek then the one who lost him.