They arrived home. Their first day of new school had gone pretty well all things considered.
"Are you okay?" Makoto asked. "You're quiet today."
"It's just… I don't know, everything. Sekai acts weird and… I've been trying to distract myself, but…"
"You're still sad about your parents?"
"Yeah," she admitted. "I know I shouldn't be, but-"
"It's okay to cry if it hurts," he told her.
"I feel like… like you and I will be the only ones left in this world."
"Would that be so bad?"
"I guess not. It's just… weird."
The door opened again.
"I'm home," Kokoro announced.
"I'll get started on dinner," Kotonoha said. "Can you help her with her homework?"
"Sure."
"But I want to watch tv," Kokoro protested.
"If your homework is done, you can watch as long as you want."
"Really?"
"Well, until bedtime of course."
She pouted. "No fair."
"I'll help you out," Makoto said. "Come on."
He held out his hand.
Kokoro took it and went upstairs with him.
Kotonoha got started on dinner. When she put on an apron, she momentarily considered wearing only an apron. But Kokoro would ask too many questions.
Maybe she could do it if Kokoro wasn't home?
She was surprised by how much she liked this. Being a domestic girlfriend was kinda fun.
Kotonoha made an elaborate dinner. When she was done, she went upstairs.
She idly wondered what they were doing.
At their door, she knocked.
"Come in," Makoto said.
She entered. They were both sitting at her desk, fully dressed. He hadn't gotten started without her it seemed.
"Are you done?" Kotonoha asked. "With her homework?"
"Almost," Makoto said. "But I think she can do the rest on her own."
"Thanks, Onii-chan," Kokoro said. She flashed her radiant smile.
Kotonoha took a deep breath. Here goes nothing.
"Now now, Kokoro-chan," she said. "You need to thank him properly."
"What do you mean, Onee-chan?""
"Why don't you give him a kiss? A real kiss."
"You mean… on his lips?" she looked confused.
"Why not? Have you ever done that before, Kokoro-chan?"
"No."
"But you love Makoto, don't you?"
"Yes," she said slowly.
"So this is normal then," Kotonoha said.
"But he's your boyfriend," Kokoro argued.
"It's okay. You're my sister, we share everything, don't we?"
"But-"
"Listen to your big sister, Kokoro-chan," Makoto said sternly.
"O-Okay."
She stood up. Makoto remained on his chair. But even then, she would have to stand on her tiptoes to reach him.
Kokoro swallowed hard. She got on her tiptoes and leaned in. Her eyes were shut tightly.
Their lips briefly touched. Kokoro held it for about a second and then retracted.
"That's not bad I guess," Kotonoha said. "For your first time."
"It's embarrassing," Kokoro pouted.
"Nonsense," Kotonoha said. "It's perfectly normal."
"If you say so, Onee-chan."
"From now on you'll thank Onii-chan like this," she ordered. "Now, dinner is ready."
They all went downstairs.
"Did you make this, Onee-chan?" Kokoro asked.
"Yeah."
"Oh no." A look of horror appeared on Kokoro's face.
"I practised," Kotonoha said. "A lot."
"But you suck at cooking."
"She's better now," Makoto said. "You could at least taste it first."
"Fine." She took a bite. "Hm, not bad."
"See. I told you."
When dinner was over, Kotonoha cleared the table. Kokoro ran off to watch tv.
Makoto watched her clean things up from his chair.
"You're not gonna help me?" she asked.
"I like watching you."
"Ye." She blushed.
For some reason, she didn't mind this. It was kinda hot to have him watch her like this. But that feeling wore off quickly.
When she was finished, she sat back down.
Kotonoha sighed.
"Everything okay?"
"I'm worried," Kotonoha said on a low tone.
"We talked about this, Kotonoha."
"Not that. I mean… don't you think Kokoro will ask questions? She believes us now, but when she's older, don't you think she'll start to wonder about mom and dad?"
"We don't know anything," Makoto said. "They left and they never contacted us again."
"That doesn't make any sense. She'll find out."
"And?"
"What do you mean?"
"So what if she finds out? She won't tell anyone."
"But what if she does?"
"We won't let her," he assured her. "Even if we have to lock her up. You can't let her ruin everything, even if she's your sister. And if you raise her right, you won't have that problem."
"Right."
"Now, I think you still owe me a striptease."
"But, Kokoro-"
"Is watching tv."
"Alright then."
They went to the bedroom. Kotonoha started the music and got to work.
He lied down on the bed and watched her. She took her time teasing him.
By the time she was done, she was covered in sweat. But she was also glowing with pride. It was clear she had pleased her boyfriend. He was completely hard beneath his pants.
She stood there, naked except for her necklace.
"I'm all naked, Sir," Kotonoha said. "What are you gonna do to me now?"
"Well I-"
The doorbell interrupted them.
What the…
Who could that be? No one even know they lived here.
"Get dressed," he ordered.
Kotonoha quickly got dressed again. She skipped her underwear.
Meanwhile, Makoto walked down the stairs.
The bell rang again.
"Coming," he yelled.
Kotonoha finished getting dressed and went downstairs.
Someone very familiar stood in the doorway.
"Sekai?"
"Hey."
Kotonoha swallowed hard. Somehow, she could sense something was wrong. Very wrong.