"This is weird Onee-chan," Kokoro said. "Why aren't you wearing your top?"

"When it's just us, it's okay to take your top off, Kokoro," Kotonoha told her.

"Then I want to do it too."

"You have a one piece," Kotonoha pointed out. "But when you have a bikini, and it's just Makoto-kun and me, you can take off your top."

"When?" Kokoro insisted.

"Soon," Kotonoha assured her.

Kokoro swam a bit further.

"Not too far," Kotonoha warned her.

"Okay, Onee-chan."

Sekai came to stand next to Kotonoha.

"I'm surprised you took it off," Kotonoha said.

Sekai shrugged. "It's my last day. It's okay to go a little crazy."

"Why don't you stay? And do this every day."

"I can't."

"You can."

Sekai hesitated.

"What's wrong?" Kotonoha asked.

"I'm scared."

"Of your mom?"

"No. Of Makoto. He… He has a way of making me do things. Things I didn't want to do before."

"I know," Kotonoha said.

"But you're not scared?"

"Oh yes. I'm scared. But I like it."

"You like being scared?"

"Being scared is not a bad thing. Why do you think people watch horror movies?"

"He's using you," Sekai argued.

"Maybe. Or maybe he just lets you do what you wanted to do all along and you're just using this as a convenient excuse so you don't have to take responsibility for your actions."

Sekai said nothing.

"And even if you were right, this is my decision," Kotonoha said. "I choose to stay with him. And nothing you say will change my mind."

"Fine. Go ahead then."

Sekai walked away.

In the distance, she saw her talking to Makoto. Kotonoha wasn't sure what they were talking about, but when she returned with Kokoro, Sekai was sunbathing, still topless.

Kotonoha and Kokoro joined her. Kokoro laid down on a towel next to Sekai.

Kotonoha turned to Makoto. She took his arms and guided him away from them.

"W-What you did before," she said on a low tone so the others wouldn't hear.

"You mean what you did?" he asked.

"What you made me do."

"What about it?"

"I… I don't know if I want that."

"Look, Kotonoha," he said. "Can we just skip your whole insecurity episode for once? I know you want this. Whether you want to admit it or not."

"How do you know so sure?"

"You got super wet, didn't you?"

"That because you were touching my… my pussy."

"No it isn't. Last night, I saw your dream. And this morning there was a huge wet spot on the covers and you were super horny."

She blushed. "That's just… a response from my body."

"Your body is honest. You should listen to it."

"But…"

"Check your pussy before talking," Makoto said. "Then you'll know you'll say the truth."

"That is…" crazy. It was crazy, right?

"In fact, do it right now. Put your hand in your panties."

Her eyes darted around. Sekai and Kotonoha had their eyes closed, but if they opened them…

"Do it already."

She quickly obeyed. Her pussy was soaking wet. She couldn't stop her fingers from rubbing circles on her clit. Her body was moving on its own.

"Now tell me you don't want to play with your ass," Makoto said.

"Fuck. Oh, please." The rational part of her brain said she didn't want it, but the other part…

"Please what?"

"Please let me play with my butt. I want it." Her fingers moved further to the back.

"Not yet," he said. "Maybe later, if you're a good girl."

She groaned.

"Lick your fingers clean," he ordered.

"What?"

"Do it, cunt."

His tone made her obey immediately. She didn't even question that he called her 'cunt'.

Kotonoha ignored the tiny part of her brain that told her this was wrong.

How could it be wrong? She was obeying Makoto. He liked it, therefore, she liked it too. And if she didn't like it, she wouldn't be so wet. Her body was being honest.

"Now," he said. "Time for some sunbathing. And don't even think about putting on your top."

"Yes, Sir."

Kotonoha walked back to the others and laid down with them. She didn't cover her breasts.

They sunbathed for a bit. Then, Sekai got up. She put on her top again.

"It's time to go," she said. "I still have to pack some stuff."

"Stay," Makoto said.

"I can't."

"Five minutes."

"No, I really have to go."

She walked to the car.

Makoto sighed. "Okay then."

All of them got changed into their clothes (no underwear for Kotonoha) and got in the car.

Makoto drove to Sekai's house. They didn't even kiss. Probably because Sekai knew she'd never leave if they did.

"Well, there she goes," Makoto said. He stared at her until she was inside.

"You could have made her stay," Kotonoha said.

"Maybe. But I have my hands full with just the two of you." He accentuated his statement by squeezing her breast. It didn't even cross her mind to try and stop him. She was just happy he was all hers. Well, her and her sister, but that was okay. She could share with her sister. She had always shared stuff with Kokoro-chan.

Kotonoha smiled at him while he worked her breast. She pushed out her chest towards him.

"Let's go home."

He focused on driving again.

Kotonoha's thoughts drifted off. What would he do with her once they got home? Would he rip off her clothes and have his way with her?

Her nipples hardened beneath her dress. She was certain Makoto could see.

She was probably dripping on her dress too.

Maybe he could smell her arousal too?

Kotonoha took a deep breath. Calm down. They weren't home yet. He had to focus on the road. As much as she wanted to lean over and take his big cock down her throat, she couldn't. That was too dangerous.

Although the fact that it was dangerous actually made it more exciting.

No, no. Don't be crazy. She didn't want them to crash the car.

After a torturous ride, they finally arrived home.

"You need a bath," Makoto told Kokoro. "Your hair is all sandy."

"Will you join me, Onii-chan?"

"Sure," Makoto said. "In fact, we'll both join you."

They relocated to the bathroom.

Makoto turned on the tap and put in the plug. Then, all of them got undressed.

When the bath was filled, they got in.

Luckily, their bath was big enough for three people. Even so, they had to sit pretty close together.

"Come over here, Kokoro," Makoto said. "I'm gonna wash you."

She went to him. Makoto put an arm around her and pulled her against his chest. Then, he picked up the shower gel and started to wash her body. He started with her tiny breasts.

"Ah, Onii-chan."

"Shh," he shushed her. "It's okay. We're family aren't we?"

"Y-Yes."

"Well then."

Kotonoha felt a tiny stab of jealousy.

No, she shouldn't feel that way. Pleasing Makoto-kun was a difficult job that couldn't be done by her all alone. She should be happy it was her sister and not some random stranger. He had already sent Sekai away, she couldn't ask for more. She couldn't send away her own sister.

Kotonoha's hand drifted down to check something.

She was wet. Or maybe that was the water?

No, no. It was herself. She was wet, therefore, she enjoyed this.

Makoto moved down to Kokoro's belly. As his hands roamed her body, it was clear her little sister started to get horny.

Makoto expertely worked her up. Then, he moved his hand down between her legs. She reflexively closed them.

"Kokoro," Kotonoha chastised her. "What are you doing?"

"I…"

"Open your legs. Onii-chan is washing your body, let him."

"It… it feels weird."

"That tingly sensation is good, Kokoro," Kotonoha said. "It feels good, doesn't it?"

"Uhu." She nodded.

"Say it. To him."

"It… It feels good Onii-chan." She spread her legs.

"There you go," Kotonoha praised her.

Makoto slowly rubbed her pussy.

Kokoro bit her lip.

He used one hand to play with her tiny tits while the other rubbed her lower lips and clit.

Kokoro moaned loudly.

He worked her closer and closer.

"Kokoro," Kotonoha said.

She was lost in the sensation.

"Look at me," Kotonoha demanded.

Her little sister forced herself to focus.

"You're about to have an orgasm," Kotonoha explained to her.

"A… is that… is that what this is?"

"Yes. But listen to me, Kokoro. It's very important you hold back until Onii-chan says you can come. Never come without permission. It's very rude. And you're a polite girl, aren't you?"

She nodded.

"And be sure to thank him afterwards. He's giving you a great gift."

"O-Okay."

Makoto rubbed her even harder.

"Ready, Kokoro-chan?" he asked.

"Yes."

"Yes what?"

"Yes, Onii-chan. Please."

"Hold it."

"Argh."

"Keep holding it."

"Please."

"Now. Cum for me."

Kokoro threw her head back and moaned loudly. Her body shivered beautifully.

After a few minutes of shaking, Kokoro recovered.

"Thank you," she said. "Onii-chan. That was amazing."

"My pleasure, Kokoro."

Kotonoha couldn't resist. She leaned in and gently kissed her little sister on the lips.

After her initial surprise, Kokoro returned the kiss.

They made out for a bit, and then disengaged.

Makoto released Kokoro-chan.

Kotonoha's eyes locked with his. The need in hers was obvious.

"Go ahead," he said.

Kotonoha turned around and got down on all fours. She raised her butt high and lowered her head as far down as it would go without going underwater.

"Makoto-kun. Just looking at you and Kokoro-chan, feels incredible."

She reached back and spread her soaking wet pussy.

"Please," she begged. "Give me your big cock. Stretch me out. Fuck me in my place."

He nodded. "Pay close attention, Kokoro. This is how you have sex."

"Y-Yes, Onii-chan."

Makoto positioned himself behind his girlfriend and pushed in his cock. It entered easily in one thrust. Easy for him at least.

Kotonoha grunted as her pussy stretched to accommodate his large cock.

He started to fuck her slow and deep.

Kokoro watched in fascination.

Then, Makoto reached out and grabbed a fistful of hair. Kotonoha thought he would pull her head up, but instead, he pushed it down underwater.

She struggled and tried to push up, but he held her tightly. After a few seconds, he let go.

She pulled her head up and breathed in the sweet oxygen.

"Ah. Makoto-kun." That was insane. She should tell him to stop.

"That felt good. I like the way your pussy grips my cock when you panic."

"It… it feels good for you?"

"Yes."

"O-Okay."

Kotonoha took a deep breath and dipped her head underwater.

He sped up his fucking. She lost focus and let out her breath. It bubbled upwards.

Kotonoha felt herself slowly drowning, but she kept her head underwater. His pleasure was more important than breathing.

Just a bit more.

Eventually, she was forced to go up to catch her breath.

Kotonoha breathed in deeply a few times to force the minimum amount of oxygen in her lungs and then she went back down. Back to what was important: Makoto's pleasure.

She repeated this a few times. The fact that she was doing it herself made it even more arousing.

She wanted to come, but she had no way of asking him for permission, so she held off.

The third time she went underwater, she felt him speed up even more. He was cumming. She could sense it.

Kotonoha kept her head underwater while he filled up her pussy.

When he was done, he thrust a few more times and then pulled out.

Kotonoha brought her head up. While she caught her breath, she spun around in the bath. Still breathing hard, she took his semi-hard cock in her mouth.

It wasn't hard enough to gag her anymore, so she could easily breath through her nose while suckling his softening cock.

Her tongue swirled around his length.

Makoto patted her head. "Good girl."

Kotonoha kept cleaning him for a minute longer. Then, she let his soft cock slip out of her mouth. It was clear he didn't want a second round.

She turned to her sister, who was now watching with wide eyes.

"Onee-chan?"

"What do you think?"

"I… do I… do I have to do that as well?"

"Yes. But don't worry. We'll go slow."

She nodded.

"Now," Makoto said. "Time for bed. It's been a long day."

Kokoro pouted, but she let Makoto help her out of the bath.

Kotonoha stayed in the bath. She needed a bit more time to recover from that intense session.

After a while, Makoto returned. He crouched in front of her.

"Hey, beautiful. You okay?"

"Yeah. That was just… intense."

"I know. But you did really well. I'm proud of you."

He placed a gentle kiss on her lips.

"I'm tired."

"Maybe it's your bedtime too?" he joked.

For some reason, her pussy responded to that. She felt herself grow wet again. "I-I have a bedtime?"

He frowned. "Do you want one?"

"Well, uhm…" she blushed.

"Okay then. Let's see." He checked his watch. "You have twenty minutes to get in bed. And no pyjamas. I want you naked."

"O-Okay."

"I'll be checking."

He walked away.

Kotonoha got up and dried off. Then, she got ready for bed.

Why was this so hot? Why did she crave his control so much?

Had he made her like this? Or had he simply released her real self?

She got in bed with a few minutes to spare.

Kotonoha waited naked beneath the blankets until he entered.

In those few minutes, her thoughts drifted off. She suddenly thought back on the pictures of her mom.

She had to ask him. Maybe he knew who that guy was? And even if he didn't, maybe… maybe he would… take pictures of her like that as well?

Her hand slowly sneaked down to her-

"Hands above the covers," a voice commanded. "No playing with what's mine."

She quickly obeyed. "Sorry, Sir."

"Don't make me catch you again." He sat down on the bed. Then, he leaned over and gave her a kiss. She eagerly returned it.

He gave her boob a squeeze above the covers. "Are you naked?"

"Yes."

"Good. Now, it's time to sleep."

"But… Makoto I-"

"Shh. It's bedtime. Whatever it is, it can wait until the morning."

"Okay."

He kissed her forehead and then turned off the lights.

Kotonoha closed her eyes.

It felt good to be taken care off.

She suddenly wondered if Kokoro was sleeping naked too. Then, she realised it wasn't important. She belonged to Makoto-kun, just like her little sister.

Satisfied, Kotonoha drifted off to sleep.