Brother, I'm in Love with a Demon (A Mario x Riba Fanfic)

Feeding The Demon (Part 1)

TW: Blood. This may also be the closest I'll ever get to writing smut.

That same night, Riba had gotten up to use the bathroom. Once he finished his business, he started walking back upstairs. When suddenly, he felt a surge of pain run through his body. "What the–Aaaah!" He shouted, dropping to his knees.

What's happening? He thought. Why do I feel like this? Then, an answer hit him. "Oh no no no! Please, not this!" But it was! And there was no way he could stop it!

Fighting through the pain, Riba ran out the door. Once he made it into the backyard, he collapsed...And the transformation began.

His face turned ghastly pale and his limbs grew longer, turning an ash-grey color. His fingers and toes became claws as he started sprouting a tail. His teeth turned into fangs and a pair of wings. Finally, a pair of black horns grew from his head.
"AAAAAAAAAAHHHH!"

Riba's agonized scream woke up Mario. "What was that?" Mario asked. He realized Riba wasn't there. Panicked, Mario started searching everywhere but couldn't find Riba anywhere. "Riba! RIBA! Where are you?" He shouted, tears pouring down his face.

Mario grabbed a flashlight and ran outside to search for Riba. He ran into the garden and saw a sight that shocked him. A demon with ruby-red white-fingered wings laid on the ground, panting heavily. Suddenly he saw a pair of gray eyes. "R-Riba?" He asked with a shaky voice.

Riba looked up at Mario. "Don't look at me! I'm a monster!" Riba shouted, covering his face.
"Monster?" Mario parroted. "But Riba you're so...beautiful."
"You're not afraid of me?"
"No, I know you wouldn't hurt me."

Mario leads Riba inside. His couch folded out into a bed which the demon stretched out on. Mario gently scratched Riba's head. Suddenly the demon made a noise. It sounded like...a purr?

"Prrrr...Prrrr..."
"Are you purring? That's adorable!" Mario scritched the devil under the chin. "Does that feel good? Do you like getting scritches~?" He asked kindly. "Yeeesss, I do," Riba replied, purring happily. His eyelids fluttered closed as a sweet smile stretched across his face. It seemed nothing could ruin this tender moment. Until Mario heard a low rumbling sound.

"S-Sorry. That was my stomach. I'm very hungry." Riba admitted sheepishly. "Let me see if I have something for you to eat."

Mario went into the kitchen and looked around. Finally, he found a crate of apples. "Perfect! Riba loves apples!" Mario returned to Riba with the crate in hand. The hungry demon devoured every last one of them.

"You were starving, weren't you?"
"Oh yes. But I'm not satisfied yet. There's something else I'm craving~"
"Well, what is it?"
"I want blood," Riba whispered in his ear. "Your blood."
"M-My blood?" Mario repeated.
"Yes. Please, just let me have a taste. If you tell me to stop I will."
"O-Okay."

"Perfect." Riba grinned. "Now, take your shirt off." "Wh-What?" Mario stammered. "Alright..." Mario took off his red t-shirt (he's not wearing overalls but black gym shorts) and stepped closer to Riba. Riba picked him up and sat him in the palm of his hand.
"Ready?" Riba asked. Mario nodded.

Riba bit Mario on the shoulder. Blood began to trickle from the wound. Riba lapped up the blood with his serpent-like tongue. "Mmm... So tasty." He purred, his tail wagging slowly. "Aaah...Riba, please..." Mario whimpered. "Please what?" Riba asked. "Are you liking this~?" "I do. It hurts but...I kinda like it." Riba smiled devilishly. "Good. Because I want more."

Those sharp fangs sank into Mario's other shoulder spilling more blood, before licking up the crimson liquid. "Aaah...Delicious. It's rare for me to come across blood this sweet." Riba said. "So, are you full yet? Or still hungry for more?" Mario asked. "I could eat a little more."

Riba bit Mario's shoulder again, causing a moan to stir. The blonde licked up the blood until it had dried. "Well, I'm full...For now." Riba gently set Mario on his chest as he laid down on his back. "Are you alright?" "Yes," Mario said. "Riba...can we do that again sometime?" "Of course, my love."

"Well, I know you said you're full but...can you...bite me one more time?" Mario asked.
"Well, I can mark you. Like this." Riba sank his teeth into Mario's neck. Not hard enough to draw blood but enough to leave a mark. "Aaah...People are gonna see that." Mario whimpered. "Good. I want everyone to know your mine." Riba whispered before licking Mario's cheek like a puppy.

"Hahaha! Aww, Riba! I love you too!" The shorter man said with a sweet giggle. Once the demon stopped the puppy-style kisses, Mario gazed up at Riba. "Hey, Riba, sweetie?" He said, innocently batting his eyes. "Yeees?" The demon replied.

Suddenly, Mario leaped onto Riba's chest with enough force to knock him onto his back. "Oi! What was that for you–?" "Shhh..." Mario whispered, pressing a finger to Riba's lips. "You had your fun with me earlier. Now it's my turn~"

"Wh-What do you mean by that?" Riba asked, sounding much more nervous than he felt comfortable with. Mario giggled "I wanna show you how much I love you. Please, I promise not to go too far. I won't–"

"I know. You're too pure, for that." Riba finished. "Alright, do whatever you want to me."

To be continued...

Oooh boy, I cut it real close! I might have to flag this book as "Mature". (^^;)