Summoned as a Heroic Spirit in Anime World

"I'm not wearing panties onii-chan," Yuki whispered as she felt his hand crawling over her buttock, then touching her pussy. 

"Mmmm!"

She moaned softly.

 "I'm already wet." Yuki's legs were weak. She was surprised and embarrassed by her arousal.

"What do you want me to do?"

"I want you to make me cum," she whispered softly. Kaito smiled at the way her voice sounded so innocent. 

It wasn't possible that she was this inexperienced.

Kaito walked Yuki over to a desk, pulling down her skirt as they got there and lifting her up to sit on the edge of it. 

He pushed her knees apart and admired the view between her legs. She didn't even have a landing strip; all her hair was gone except for a few soft hairs.

"You're a bad girl for being so naked under your skirt," Kaito teased.

She smiled and blushed a little bit, and Kaito knew that she liked what he had said. "I thought it was more likely that you would be in the mood," she explained.

"Alright. I'm gonna put my mouth on you and lick your pussy until you cum," Kaito said.

Yuki nodded. Kaito was so grateful to have such a sexy sister. He got down on his knees in front of her and spread her legs even wider, pushing her skirt up out of the way. Her pussy was so beautiful, the inside of her labia was a lovely shade of pink. Kaito dipped his face down and licked the length of her slit with his tongue, making sure to not touch her clit yet. She shivered and arched her hips. He licked again, this time dragging his tongue over her clit. "Ah! Ah! Oh my god!" She cried out.

Kaito laughed and licked her clit again, back and forth until Yuki's breathing got fast. "Yes. Yes," she moaned and he continued to lick and suck her clit until her body started to shake and she came.

"Good girl," Kaito praised her when he finished.

"That was amazing," Yuki moaned softly and Kaito helped her off the desk. "Oh. Now I really have to pee."

"Go pee then. I'll take you to bed," Kaito laughed. It took a while for her to pee, because her legs were still shaky from the orgasm. But he was patient. When she came out, he took her hand and led her over to the bed.

Yuki fell onto her face and rolled over onto her back, kicking her shoes off and leaving her skirt on. Kaito undid her top button and pushed his hand into her shirt. He felt her breasts and she groaned softly at his touch. 

"Do you want me to take your clothes off?" He asked.

"Yes," she said in a small voice. Kaito unbuttoned her shirt and pushed it off of her shoulders, leaving it to pool around her waist. 

She had such nice breasts and her pink bra made them look even better. 

"You're beautiful," Kaito told her. He had to say that, it was important. Yuki always had to hear that. She was very insecure about her body.

"Thank you, onii-chan. You're hot too," she said and Kaito could tell that she meant it. He kissed the front of her bra, enjoying her moans and gasps as he licked and sucked her nipples through the fabric.

He pulled her bra straps off her shoulders and pulled it up over her head. Her tits were so perfect, small but nice. He licked and sucked her nipples until she was moaning. 

"You really want to fuck don't you?" He asked. She nodded her head eagerly.

 "Okay, I'll let you ride me."

Kaito stood up and took off his pants and boxers, letting his cock hang out at full attention. Yuki sat up to watch him and licked her lips. "I love your cock," she said shyly.

Kaito chuckled. 

"Good girl," he said and climbed into the bed, lying down on his back. 

"Come here," he said, beckoning her to come and sit on him.

Yuki scrambled over to him and straddled him, running her fingers down his cock and licking the head of it. She was going to suck him. Kaito closed his eyes and enjoyed the feeling. 

Her mouth was warm and soft as she took more and more of him into her mouth. 

Yuki licked and sucked him until Kaito stopped her, because he didn't want to cum before he fucked her.

Yuki licked her lips as Kaito pulled her up by the hair, pulling her onto him. He held his cock down for her to sit on. 

She sat down on it slowly, taking him in inch by inch. 

Yuki gasped as he filled her up, and moaned softly. She was so tight.

"I like how big you are," Yuki said and kissed him.

"Mmmm," Kaito moaned in response and pulled her down to kiss her back. They kissed passionately and Kaito's hands wandered down to her hips. She started to move, rolling her hips and moaning at the feeling of his cock inside her. "You feel so good onii-chan!" She gasped.

"You feel good too," he told her and lifted her up and down on his cock, moving her until she moaned with every thrust. 

"Oh yes. Oh yes. Oh god, oh god, oh god," she moaned over and over again.

"Are you gonna cum?" He asked her.

"I'm close. I'm close," Yuki told him. He moved her faster and she clutched at his shoulders, moaning loudly with every thrust of his cock in her.

 "Oh god. I'm cumming onii-chan! I'm cumming!"

Yuki gasped and moaned as her orgasm shook her body. She leaned forward and kissed him again, rolling her hips on his cock as he thrust up into her. 

After a few moments, she collapsed onto his chest.

"Mmm you're so warm," she said softly.

"You're so warm too," Kaito responded. He pushed his hands into her hair and she kissed his chest. "I love you," he said.

"I love you too," Yuki replied, lifting her head to look at him. "You're so sexy."

"You're sexy too," he responded. "Want to keep going?"

"Yes," she answered. Yuki got off of his cock and climbed up onto his chest, rubbing her pussy on his chin. Kaito stuck his tongue out and licked her clit. 

"Yes," she moaned. He licked her more, until she was moaning loudly again.

"Will you suck my dick?" He asked and Yuki smiled.

"Of course. Of course I will," she answered. She bent down and started licking his cock. Kaito gasped. She was so good at this. She sucked the length of his cock into her mouth and moved her mouth up and down. "Mmm," she moaned around his cock.

"You're so good," Kaito sighed, enjoying the feeling of her mouth on his dick. He lifted his hips a little bit to meet her, but he didn't want her to gag so he stayed still mostly. 

"That's it. That's good. Good girl." 

He praised her as she moved her mouth around his dick and licked it.

She pulled his cock out of her mouth and looked at him with a mischievous expression. "I want you inside me," she said. "I'll ride you again."

"Alright, good girl," Kaito answered and Yuki crawled back down and straddled his hips again. She sat down slowly, moaning as his cock filled her up. He watched her face as she sat down all the way, her eyebrows furrowed in concentration.

 "Good?" He asked.

"Mmhm," Yuki answered. 

"It's so big. I feel so full," she groaned. "I'm so wet," she added and licked her lips.

"You're so hot," Kaito moaned and lifted his hands to squeeze her tits. Yuki moaned too and leaned into his touch, letting her head fall back.

Kaito sat up too, wanting to kiss and touch her breasts better. She moved her hips up and down on him, moaning at the way he filled her. "Oh yes," she gasped. "Yes, yes."

"I love your tits," Kaito groaned against them. He squeezed them and pushed them together, rubbing his face in them.

Yuki moaned loudly and moved her hips faster. "Oh yes! Yes, yes. I'm cumming again onii-chan! Oh god oh god oh god!" Yuki cried out and shook as her orgasm went through her.

Kaito pushed her back until she was lying down again and started thrusting into her. "That's good girl," he praised her. 

"Good job cumming for me."

"Yes!" She moaned in response, lifting her legs to wrap around his hips.

 "I feel so good!"

"You look good too," Kaito replied. Yuki was so beautiful with her hair spread all over the bed, her tits bouncing up and down as he thrust into her.

"Mmm," she moaned in response. "I love this."

"You're so wet," Kaito added and pushed her legs back, getting deeper inside her. She moaned and gasped, arching her back and lifting her hips to meet him.

"Y-yes! Yes! I'm so wet because I'm such a slut," Yuki whimpered.

"Oh fuck yes," Kaito groaned. He loved it when Yuki called herself a slut. He could tell that she loved saying it too.

"I love sucking your cock and getting fucked," she moaned. "I love being a slut for you onii-chan."

"Oh god!" Kaito cried out. He was close. He moved his hips faster, thrusting into her until she screamed his name. "I love that slutty mouth on my cock," he gasped.

"I love it too! I love being a slut onii-chan. I want your cum onii-chan!"

"Fuck!" Kaito grunted. "Fuck me!"

"Yes," Yuki cried and shook around him. "Cum inside me!"

Kaito couldn't hold back anymore. "Oh fuck," he moaned. "Oh god, oh god, yes. I'm gonna cum!"

"Y-yes," Yuki gasped. Her eyes were so wide and innocent.

Kaito pulled out of her and started stroking his cock until he came. He pumped out all over Yuki's stomach, groaning and grunting as he did. "Oh my god," he sighed. "That felt so good."

"Good job onii-chan," Yuki purred, smiling up at him. "Now that you cummed inside me, do you want to lick my pussy?"

"Mmm," Kaito moaned. "Yes." Yuki spread her legs for him and Kaito lay down between them, pushing his face into her pussy.

"Oh yes," she cried. Kaito licked her until she came, enjoying the way she tasted and the noises she made. 

When they finished, she cuddled next to him and they took a nap. "That was fun," she said sleepily. 

 Kaito answered, putting an arm around her. He loved holding her. It made him feel strong and good. 

She fell asleep, curled up in his arms and he drifted off not long after.