Work Text:
Serizawa was sweeping the floor when he noticed the bathroom door was open once again. The mechanism was on the flimsier side, and the recent humidity kept the door from closing all the way more often than not. It was really only slightly ajar, but it wouldn't be very professional to give clients a direct view of the bathroom. He reached out for the doorknob to close it.
And stopped, hand hovering in the air. The light was on.
Despite himself, he glanced inside, just for a moment. His boss sat on the closed toilet lid, jacket opened and tie loosened, pants bunched up at his feet. His head was bowed down, but Serizawa could see one hand was slapped over his mouth, the other slowly jerking up and down the length of his dick.
He tried to look away. He tried, but his mouth was dry and his heart was hammering in his chest. He'd never actually seen another man's nude body in person before, much less anything erotic.
This was so much more visceral than any porn he'd ever seen and his own pants were growing tighter by the second.
Serizawa's eyes were glued to Reigen's hand as it moved; at the way it played with the head, thumb swiping over the clear fluid beading at the tip and smearing it all over.
He could hear Reigen start to pant behind his hand; his own breathing sounding ragged to his ears. He felt almost dizzy.
Reigen gave himself a few last hard strokes, before covering the head of his dick, biting into his other hand to cut off a whine. Cum spilled from in-between his fingers, running down his palm.
Clearly acting on instinct, Reigen quickly licked up along his wrist to prevent anything from dripping onto his clothes, swallowing it without a second thought.
Serizawa inhaled sharply at the display.
Reigen's head snapped up, hazy eyes meeting his own through the gap in the door. Serizawa swallowed heavily, shame bubbling up inside. He waited for the other shoe to drop.
Reigen cocked his head. Then slowly licked up one of his fingers, staring straight at Serizawa as he did. Then lapped up another, taking the time to lick off any drop of cum from his lips while Serizawa could only stare, utterly frozen in place. Reigen kept going until his hand was clean. Once done, he nonchalantly dressed himself back up before washing his hands.
Serizawa's brain came back online just in time to step away before Reigen could open the door.
"Were you waiting on me to use the bathroom?" Reigen asked, as if everything was normal and he somehow couldn't see the impressive tent in Serizawa's pants. He walked away, clapping Serizawa on the back as he added, "Just make sure to check you've really closed the door, alright?"