The Ereri Project (#2)

Succubus (Incubus!Eren)

A/N: I've promised this to someone for a really long while!

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Satan was glad for the challenge of turning a human male into a succubus.

Most of the succubaes are females, of course, just as most of the incubi are male, but it's not unheard of to have the sexes swapped.

The humans they have to seduce all have different desires, after all.

When all is said and done, Levi is covered in shimmering silver tattoos like Eren's, his eyes have turned a glowing shade of purple, he is made a little shorter and more petite, he has small twin horns poking from opposite sides of his forehead, large bat wings on his back, and he has extra sharp canine teeth. He looks like all the other succubae.

And Eren's eyes burn at the sight of him.

Satan looks down at Levi. "Do as you will, my child. You're free to go wherever you want and do as you please under two conditions."

"Yes, sir?" Levi asks.

"First, as a succubae, your body will begin to lust in a way you've never felt before, including your body lubricating itself the way a woman's does. Second, you will return to my castle to do my bidding should ever I call for you."

"Yes, sir."

"Good, you may go."

Eren takes Levi's hand and immediately pulls him out of the big, red man's throne room. Levi finds his skin burns at the contact, embarrassingly, nearly making him moan.

Eren drags him through the castle to his bedchamber and throws Levi on the bed, climbing on top of him.

Levi pulls him into a harsh kiss by his hair, teeth and tongues clashing painfully but if Levi's being honest, he doesn't really give a shit.

Eren growls into it, grabbing Levi's hips to grind their erections together. Levi breaks the kiss to whimper out a moan, holding onto Eren's shoulders.

"Oh my~"

Eren licks from Levi's collar, up his neck. "Ready for your first cock as a succubus."

"Now," Levi moans, grinding his erection against Eren's abs.

Eren chuckles, moving to grind between Levi's asscheeks instead. Levi groans and shudders, grinding into him. "Eren please!" he cries.

Eren lets the head of his cock breach the tight, soaking wet passage. Levi's entire body shivers, his entrance spasming, waiting to swallow Eren whole. "Say, Levi," Eren says casually, teasingly. "I don't know if I still wanna do this."

Levi's eyes shoot wide, glaring daggers at the brunet. "If you don't starting fucking me right now, I will find a way to kill you that will be slow and tortur–"

Eren shifts his weight and slams his hips against Levi, making the succubus scream and cum between their chests. "Already?" Eren asks with a smirk.

"Shut the fuck up and keep going," Levi pants.

So Eren does, swinging his hips as hard as he can manage into the smaller man. After a long moment, he pulls out and rolls Levi onto his knees, sliding easily back inside. "E-eren," Levi says.

"Yeah?"

"C-can you m – ah – make your – your dick bigger?"

Eren pulls Levi's hips flush against him, seating himself fully inside and concentrates.

Levi shudders as he feels Eren get longer and thinker inside him. "Fucking– ah!" Levi shouts as he cums again.

Eren continues fucking him as Levi gets an idea. If Eren can make his dick bigger, can Levi make his hole smaller? He tries to focus all his attention of the area and Eren's mouth falls open with a strangled moan. "Fuck~! Levi!"

He comes hard inside the smaller man, grasping his pale hips so hard he wonders if he might actually break the bones inside.

As soon as he's done, he pulls out. Levi turns his head to complain but he sees Eren bending over. Levi feels his cheeks being pulled apart as Eren puts his face closer. Levi's mouth goes wide as he feels Eren's tongue slide inside him. He moans, roughly gripping the sheets as Eren sucks his cum out of Levi.

Eren pulls the cheeks apart further and licks around, making sure he got it all before pulling Levi up by his hair. Levi welcomes the kiss at first, but then he notices Eren forcing his tongue in his mouth, introducing a new flavor to him, pushing something slimy into Levi's mouth.

Levi's eyes go wide. The semen Eren just sucked out of him. He holds Levi's head in a vice so the smaller man couldn't pull away even if he wanted to. He moans and lets Eren transfer all of it over. Eren pulls back from the kiss. "Now swallow it."

Levi stares in Eren's eyes and audibly swallows, making Eren shiver. "Fuck yes," he moans quietly.

Levi gets closer to Eren again and straddles his lap, positioning Eren's erection at his entrance again. "You little cockslut," Eren mutters.

"I'm a succubus now, darling, this is going to be the rest of our lives."

Eren pulls Levi down by his hips so his cock slides in all at once. "Oh God," Levi moans. "I hope I never get used to that."

Eren closes his eyes to take in the feeling of Levi's walls clamping down and massaging his erection. Levi picks up Eren's hand and moves it to his ass where the two of them are connected. "Touch it," he says.

Eren opens his eyes and gently fingers the tight muscle that is gripping the base of his cock. Levi moans at the prodding sensation, rolling his hips. The rolls quickly turns into Levi rising and falling, fucking himself on Eren's dick.

Eren uses his other hand to grip Levi's other asscheek and prods his entrance with fingers on both hands. Levi tosses his head back, relishing in the sensations.

Eren stares up at Levi's face as he slides both of his index fingers in beside his cock. Levi cries out, thrusting harder.

Eren smirks, pushing in both of his middle fingers as well.

Levi leans back on his hands, picking up and dropping his hips while gripping Eren as much as he can.

"Such a whore," Eren says. "I think you could take on a few men at one time easily."

Levi moans.

"Want me to arrange that, darling? I have friends even bigger and more aggressive than I am who would love a shot at this little hole of yours."

Levi pants, drool sliding from his open mouth, down his chin.

Eren pulls his finger apart, making Levi scream. "Actually, it won't be a little hole for long at this rate."

Eren pushes in his ring fingers and pulls harder, making Levi drops his weight and spasm as his cum bursts from his dick and he pants heavily.

Eren chuckles as Levi calms down, pulling out of him. Levi reaches to jerk Eren off but the incubus swats his hand away. "But you didn't get off again."

Eren rolls his eyes. "You need a nap, we can play when you wake up."

Levi is asleep before Eren is done speaking.