You and Sheldon had been friends for a little while now. You had gotten to know eachother when Penny invited you over.

At first Sheldon had his opinion about you and made his opinion very clear. But over the months he had gotten used to you, even though he'd still make snarky comments and such.

The last few weeks he had been working non-stop on some new project. He had been working so hard that it eventually overwhelmed him.

That evening you got home from work and you saw Sheldon sitting on the stairs, with his arms on his knees and his chin on his arms.