The Book Of IDOLiSH7, TRIGGER, Re:Vale, and ZOOL Oneshots

TennRiku (Smut AU)

(A/N): Omegaverse TennRiku! Specifically, Omega!Riku and Alpha!Tenn!

Riku whined, back flush against the wall and wriggling. "Tenn-nii," He moaned.

"Now, now, Riku," Tenn chastised softly, licking the shell of Riku's ear, "Don't make that face." Riku whined.

"But, Tenn-nii!"

"Shh, now," Tenn said, cupping Riku's face with a hand, "You're in heat now, I have to go gentle."

Riku whimpered and tilted his head, allowing his scent to float over Tenn. It was so sweet, so full of heat and Riku, Tenn felt himself falling into a rut.

"Come on, now," Tenn coaxed, "Clothes off, now."

Riku obediently complied, raising his arms and lifting his hips so Tenn could take all his clothes off. He whimpered when his bare bottom met the air.

"My, my, Riku, I didn't know you were already this far gone." Tenn clicked his tongue. "So much slick between your thighs already."

Riku looked at him with tear-filled eyes. "Have I been bad, Tenn-nii?" He whispered.

"No," Tenn assured him, "Just the contrary. Now, help me here." Tenn ducked and positioned one of Riku's legs over his shoulder, straightening and prodding a finger at Riku's hole. "Does that feel alright?"

Riku whined. "Just put it in already, Tenn-nii! Stop teasing me!"

Tenn chuckled. "Alright, then," He said, pressing his finger inside Riku, "Don't come to me when your heat's over and you can't move."

Riku arched his back and whined, clenching around Tenn's finger. Almost immediately he was begging for more.

Tenn clicked his tongue again. "So naughty, Riku, begging for my fingers." He leaned forward and whispered sexily in Riku's ear. "You just want something bigger in you, don't you?"

Riku nodded vigorously as Tenn pushed another two fingers inside him. His twin was already so loose, and Tenn was falling hard into a rut and arousal, it wouldn't be much longer now. Dirty thoughts were already crowding  his mind.

Riku arched his back. "Please, Tenn-nii! I want you inside me!"

Tenn looked at him worriedly. "Riku, I don't have any lube though," He protested, a last attempt to stall off his rut, "Or a condom! Do you want a child?"

Riku looked at him stubbornly. "Fine! If Tenn-nii won't do it, I will!"

Before Tenn knew it Riku's leg was off his shoulder and his twin was kneeling in front of him, pulling Tenn's pants and underwear down. He gasped when Riku licked his cock.

"This part of Tenn-nii is just so hot," Riku mumbled, "Just like mine."

Tenn moaned when Riku took him all the way, despite the strain on his lips and throat and his gag reflex that was probably reacting now. His hand crept through Riku's hair, and he stifled moans as Riku flicked his tongue almost kittenishly over him.

To say that the accompanying view was mesmerizing would be a complete understatement.

Not only was Tenn able to see Riku kneeling, legs tucked beneath himself, this position offered a very nice view of Riku's flushed and leaking ass. Tenn watched every twitch and wriggle, every time Riku's hand would reach back to finger himself before his twin stopped halfway. He felt every moan and lick from Riku.

The sight was such, such a turn-on, to Tenn it might have been illegal.

Riku came off him with a small pop! noise and a smirk. "Now Tenn-nii doesn't have to worry about lube!" He said proudly.

"But what about-" Tenn protested.

Riku blushed. "I don't mind carrying Tenn-nii's child," He mumbled, "After all, it's going to be our child, right?"

Tenn growled and once again lifted Riku's leg onto his shoulder. "I swear you're not going to be able to move tomorrow, Riku." He plunged into Riku, not bothering to slow down and wait, instead immediately thrusting in and out.

Riku let out a small scream, clutching Tenn's shoulders with white hands. Tenn moaned and pounded into Riku faster, harder, deeper, following all of the pleas spilling out of Riku's mouth. Praise spilled like rain from his own.

"So tight, Riku, so hot, you feel so like a virgin. You smell so sweet, and you moan so temptingly, I want to mate you right now. But I can't, can I. What would the world think, two siblings mated? Much less one an omega and the other an alpha, much less that they are twins. But I want to mate you so, so bad, I want to make you mine. Only mine. Only my knots, only my ruts, only my children. You'd like that, wouldn't you. Belonging only to me. Oh, you're close, aren't you. I can feel it. Cum for me, Riku."

Riku shouted and came, cum splattering on Tenn's stomach. Tenn moaned and came as well, nearly collapsing against the wall. He panted, watching Riku's eyelashes flutter and his lips part and his cheeks redden as he waited for his knot to go down.

After a while when his knot went down, Tenn pulled out of Riku, followed by a rush of cum dripping onto the carpet. Riku looked at him with teary eyes and a whimper.

"Tenn-nii, get inside me again," He begged, pointing to his ass. Tenn looked at his hole, clenching needily around nothing. "I can take it!" He moaned.

"You're going to be so filled with my cum when this is over," Tenn growled, kicking open the door to his room. He closed it securely, laying Riku out on his bed. Riku whimpered, looking at him. Tenn crawled over to him. "You're so greedy, Riku," He growled, "So naughty, so needy, begging for my cock. Your ass is so red, I bet if I slapped it it'd be shining. And you're so hard again, look at all that precum. You just want my knots, don't you, you want my cum, you want to be filled to the seams, you want my children in your body."

"Yes, yes, please yes, Tenn-nii!" Riku begged. "Just fuck me!"

They didn't come out of that room for a while.