Lightning by Simons_Flower.
In the wee hours of the morning, Harry stirred at the sound of someone in his room. Cracking his eyes open, he saw Ron’s outline in the moonlight. A waning moon just past full, it cast enough light for Harry to watch Ron undress.
There’d been an awareness of him all day. Well, were he to be honest with himself, since Ron first pulled the corner of that blanket off his face and pushed back his fringe to reveal his lightning-bolt scar. Some connection had sparked between them that Harry couldn’t identify.
And because it was there under the surface, something he couldn’t identify, he was wary of it. He didn’t think he was afraid of the feeling, but he was afraid of what that feeling might mean.
It was what drove him to watch Ron undress by moonlight. With each article of clothing shed, Harry become both more aroused and more terrified. When Ron got down to his boxers, Harry began silently praying - if “Oh God” could be considered praying - but he didn’t know if it was for the removal of the boxers or for Ron to leave them on.
He was so caught in his conundrum that he almost missed Ron staring down at him, sighing heavily, and murmuring, “Oh, Harry,” with such longing it actually made Harry uncomfortable. Ron sighed again, then crawled into the bed opposite Harry’s.
It was nearly dawn before Harry got back to sleep.
Congratulations!!