Really short one-shot
TPP
Levi lathers his body in soap as Erwin stands in front of him, washing the soap suds from his hair. His back is facing Levi, his muscles bulging out of his body. Levi's eyes travel down to the curve in Erwin's back, then to his plump ass.
He remembers all the times Erwin would slap his ass, as hard as he could. It always left a print, and Levi imagined how bad it would hurt since they're in the water.
Without thinking, Levi reigns his hand back and slams it into Erwin's ass at full force. Erwin yelps, jumping a little and Levi quickly averts his attention to 'washing his legs'.
"Owww....what was that foorr?" Erwin whines, pouting while he rubs his abused cheek. Levi acts innocent but soon giggles at Erwin's expression. Erwin smirks and pulls Levi into him, squeezing him tightly and anchoring him in place.
"Ah, no! I give up! I'm sorry!" Levi tries to forfeit, but Erwin wasn't having it at all. Levi's giggling until Erwin's hand rains down on his left cheek. He yells and hides his face in Erwin's chest, smacking his pecs.
"Aww, poor baby." Erwin coos, mocking Levi.
Levi pulls away from his chest and glares, not amused in the slightest. His strong demeanor is defeated when Erwin slaps his ass once again.
"Gah! Damnit Erwin that isn't fair, I only slapped you once!" Levi whines.
"Life ain't fair, get over it." Erwin says before turning back around. Levi washes the suds off of his body and bites his lip.
He slaps Erwin's ass as hard as he can and before Erwin can turn around, Levi's bolting out of the shower and putting on clean boxers. He grabs his sleep shirt before running out, closing the bathroom door behind him.
"Levi!" A muffled Erwin shouts from the other side of the door.
Levi's giggling uncontrollably, so hard even Erwin has to laugh a little.
"Okay, fine. I deserved that." Erwin admits.
The laughter dies down and Levi stumbles away from the bathroom, Erwin coming out soon later.
Based off true events 😝 -Spruce