TMNT/FNAF/Creepypasta/Undertale FanFic Oneshots! (REQUESTS CLOSED)

Vampire!Leo X Donnie

Requested by @Tmnt2456
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Leo had told his brothers that he wouldn't be gone long. That he would be on a solo mission for about a month
That was a year ago. 380 days total. Donnie had been keeping track, he couldn't keep Leo out of his head. None of them could. They all worried about where he was and when he would be coming back.

Leo was... fine. He wasn't sick or dying or anything. Well... in a way he was.. dead... but he's okay now. That's all that would matter to his family anyway.

He lived in an old castle out of the city, in the middle of the forest. He was by himself there, hunted down animals and drank their blood to keep himself from going crazy.

He thought about his family frequently, particularly Donnie. He missed him the most and spent the rest of his time cleaning the castle for him. He would go to he lair, take him back to the castle, and live with him forever.

Leo licked his sharp canine teeth and smirked to himself, thinking about the purple clad turtle. He leaves his castle and makes it to the city, finding his way to the lair.

Donnie was sleeping on the couch as Leo walked in. The blue clad vampire smiled and walked over to him. Donnie was really adorable when he was asleep. Leo stroked his cheek gently and went to lean down and bite.

"Leo??"

Leo looked up from Donnie and saw Mikey in the hallway holding his duct taped teddy bear.

"Leo!!!" Mikey grinned and ran over and hugged him tight. Leo smiled uncomfortably and hugged him back.

Raph walked out and saw him and walked over. "Where have you been?" He asked.

"I just got caught up with the solo mission. I'm really sorry it took me a year." Leo rubbed the back of his neck.

Donnie woke up and sees his brothers. His eyes widened when they trailed to Leo. "Leo...?" He sits up.

"Hey, Donnie." Leo smiled.

Donnie beamed and hugged him tight. "Where were you?? We were all worried!"

"I know I'm sorry," Leo hugged him. "I was stuck in the mission and I wasn't able to come back till now."

"I'm glad you're back." Donnie smiled.

"It's good to be back... but I won't stay for long..." Leo pulled away.

"What?" His brothers frown.

"Why not?" Donnie looks at him.

"Well... it's a lot to explain... but I'd like it if you came with me, Donnie."

"Wait, Leo. What the hell you mean you have to leave? You just got back here." Raph glared at him.

"Yeah, my bro just got home and then he wants to leave and take my other bro with!" Mikey frowns.

"Where are you even planning on going?" Raph asked.

Leo looked from his confused brothers to Donnie. Raph notices the vampire bite on Leo's neck and frowns. "What's that?"

Leo grinned and his eyes flashed. He used his super speed and everything seemed in slow motion to him while he was as fast as lightning to the others. He grabbed Donnie and ran out of the lair, Mikey and Raph chasing after him.

Leo ran out of the city, carrying Donnie bridal style and to his castle.

"Leo, let me go!!" Donnie squirmed. The vampire turtle set him down on his bed and Donnie scoots back a little. "Leo, what the hell is going on?" Leo pinned Donnie down and hovered over him. The purple clad turtle noticed the bite himself. "What happened to your neck??"

Leo sat up slightly, sitting on Donnie's plastron. "That's why I was gone."

"What is it?" Donnie frowned. Leo showed his vampire teeth and Donnie's eyes widen. "I-Is that why you brought me here? To kill me?" His rust colored eyes started to tear up.

Leo's eyes dilated and he shakes his head. "No no no! That's not the reason why." It kind of was, but telling him that would scare him away.

"Then why did you bring me here?" Donnie demanded.

"I want you to live with me here for the rest of our undying lives. I want you to stay with me forever," Leo held his hands and pulled him up and cupped his cheek. "I missed you so much, Donnie, I can't bare to lose you again. That's why I have to do this."

"Do wh-"

Leo tilted Donnie's head to the side and bit into his neck. Donnie gasps and tried to push Leo off, shaking as Leo licked the bite and drank his blood slowly.

"L-Leo..." Donnie fell back and panted as he slowly loses blood.

~*~

Donnie turned and woke up, seeing he was still in the king sized bed inside the castle. He looked over at the window and saw it was the middle of the night. His neck ached a bit and he got up and walked out and downstairs. He looked around and found his way to the kitchen.

Leo was there and Donnie clenched his jaw. He stormed over and Leo turned the same time Donnie punched him hard. He hugged his hand as Leo hadn't even flinched from the hit.

"You son of a bitch!" Donnie hissed.

Leo chuckled and stroked his bite mark seductively, cornering him against the counter. "You know you look so adorable~"

Donnie blushed and looked away and Leo grabbed his chin and turned his head to look at him. "Don't touch me." The purple clad turtle scowled.

Leo smirked and pressed his lips against Donnie's, holding his neck. Donnie blushed and felt himself start to kiss back. Leo lifted him up onto the counter as the two continued to kiss. Leo pulled away slightly and Donnie looked at him, playing with the tails of his mask.

"I'm glad you took me here..." Donnie whispered, making Leo grin.

"I'm glad too."