Work Text:
AU in which Eren has the hots for his adoptive father, Levi.
Levi honestly tried in bringing Eren up the right way, but the teen has always been rebellious since he was a kid. In Levi's perspective, Eren could do no wrong, so that's why when Eren - all grown up, taller than him and rocking a man bun like a hobo - Levi's sees it as nothing. Even though Eren grabs him in public and glares at the interested men with emerald eyes burning with hellfire, Levi sees nothing of it, already used to Eren's cat like behaviour. He just pats Eren's head.
That is until when Eren starts sneaking into his bed naked. Levi finds it weird that his 19 year old son is still this way, and when he speak to Hange about it, they just look at him strangely, amused.
Levi's eyes gets open to the clear facts when Eren, tired of his father's obliviousness, grabs Levi around the waist and pulls him into a deep kiss. Levi's shocked by this and Eren uses this chance to push him against a wall before picking him up. Levi automatically wraps his legs around Eren's waist, grunting a little as his back meets the wall.
"For a man of your age, you're quite dense, otou san." Eren says with a sly smirk, eyes shining with mirth before taking Levi's lips once again.
One thing leads to another and a few hours later, a sweaty Levi is staring at the ceiling with teary and hazy eyes, body bruised and decorated with love marks, cum - in a heavy amount - trickling down his ass unto the sheets, and chest heaving from the heavy workout; Eren by his side - equally sweaty, hair down from its bun and fanning his face as he nuzzles and kisses Levi's neck, his arms around his father as he mumbled words of endearment.
'How did this happen?' Is all Levi's pleasure ruined brain could bring up.