A/N - Poo, this is too long, its 122 words… And I was doing so well! But ha, unintentional confessions ftw... :D
Cas first noticed that there was something strange when his hand had accidentally brushed against Dean's.
He'd felt the most curious sensation; a kind of tingling, almost like electricity.
It happened again and again, whenever and wherever they touched, no matter how lightly.
It didn't exactly bother Cas - in fact, he liked it. But it confused him, and when he began to feel strange when Dean simply looked at him, Cas decided it was time to find out what was going on.
So he asked Sam, the most knowledgeable human he knew.
But apparently Sam didn't know either, because he smiled and said, 'Why don't you ask Dean?'