The Reason Why
He smiled as he stroked his lover's soft hair with careful digits. He had waited so long for this day and intended to savor it fully...
Bringing up the brush he held in his other hand, he gently combed through the silky mass... drawing out each stoke as long as he could. From below, the other man sighed happily and leaned into each pass. For once, his lover looked relaxed, his expression almost young.
This was rather amusing. He had to fight to get permission to do this in the first place... then it turned out that the other alchemist liked having his hair brushed just fine. Protesting was probably just in his nature. So like him to be contrary and pretend there was nothing he especially liked or disliked.
"Done!" He finished with a flourish and then stepped back to admire his handiwork. There hadn't been much to do, but it had been fun while it lasted. The young man's smile widened even farther a second later as his lover snapped out of his trance and then pouted up at him.
"Already!"
"Well," said Ed as he turned to put his hair-bush back on Roy's dresser. "You don't have all that much hair."
A sigh met that remark. "See, this is why I advised against this. Much easier to drag the story out if it's me brushing your hair." Roy gestured to Ed's long braid as he spoke. "That is what everyone else does!"
The Fullmetal Alchemist's only response was an amused chuckle.