Evening, at the Fujiwara residence.
In the living room, Chika sat on the sofa, her clothes still on for the moment, but her body was curled up in a defensive, shy posture.
Rin, Kaguya, Hayasaka, and Moeha surrounded her. With Kaguya holding the camera, it looked exactly like a low-budget porn set. Chika's bashful expression only added to the vibe.
"Guh... don't... don't stare at me like that!!!!"
Facing Kaguya's lens and the four sets of eyes, Chika shrank further into herself.
Rin smiled. "If you're that shy, why not wear a mask?"
Chika nodded vigorously, not catching the lewd implication. After Moeha brought a mask, Chika put it on without hesitation... Now it looked even more like a "pre-interview" for an adult video, but the mask clearly helped her relax.
"So, Miss Chika, you are a student at Shuchi'in Academy, correct?"
"Eh... yes." Though she didn't know why Rin was asking such scripted questions, Chika nodded. After he asked a few trivial questions to lower her guard, he struck.
"There are many rich heiresses at Shuchi'in. Do you pleasure yourself, Miss? How many times a week?"
"Thre— WHAT KIND OF QUESTION IS THAT!? Just start already!!!!"
"I'm not the one starting, you are. You're the one teaching Moeha how to do it."
"Yeah, yeah, Sis, hurry up!" Moeha's cheeks were flushed with anticipation. "If you're too shy, Big Brother can teach me instead..."
"I GET IT!!!!!"
Powerless against Moeha, Chika gave up. She pulled off her Shuchi'in uniform, revealing white lingerie with pink bows. Under Moeha's intense gaze, she slowly removed her bra and panties.
Kaguya and Hayasaka thought the same thing: Sow!
Under the four pairs of eyes, Chika's pale breasts and pink nipples became erect. She sat with her legs pulled up, her left hand across her chest and her right hand covering her crotch.
Then she realized something.
"Why are YOU in here? I can teach Moeha myself; I don't need you as a 'teaching aid'! And Kaguya, why are you filming this?"
Before Rin or Kaguya could answer, Moeha provided the excuse.
"Big Brother is a professional~ Sis might not know as much about the female body as he does. It would be bad if you taught me something wrong. And if Kaguya-chan records it, I can re-watch it if I forget something~"
"..." It was logical and hard to argue with.
Chika didn't want to fight anymore. She just wanted this over with!
Leaning against the sofa back, she placed her feet on the edge of the cushions and closed her eyes. She spread her legs wide.
"Ahem," Rin cleared his throat. "Moeha should have learned about basic female anatomy in school."
"Mm-hmm!" Moeha nodded heavily and reached out toward Chika. She pressed her index and middle fingers together, then spread them against Chika's folds. "Sis looks so pretty here. Teacher said this is called the..."
Even with the mask, Chika covered her face with her hands. Even though she had been thoroughly used by Rin before, being explained like a biology diagram in front of Moeha made her neck burn with shame.
"The teacher only explained the basics... Eh? Sis, why are you wet already?"
Chika wasn't Megumi; she didn't have an exhibitionist streak. She was wet because Moeha was "accidentally" brushing her fingers against her clitoris while she talked. Throughout the explanation, Chika kept her face hidden, unable to meet the eyes of Kaguya and the others.
"That means your sister's body is excited. The teaching can officially begin," Rin said.
Desperate to end the ordeal, Chika took her hands off her face. One hand gripped her breast while the other reached between her legs and began to move.
"No, that's just a demonstration, not teaching," Rin shook his head solemnly. "You have to explain every step. A girl's body is delicate. If Moeha tries it herself and uses too much force, she could hurt herself. You have to teach her 'hands-on'."
Moeha sat next to Chika and gave a thumbs up. "As expected of Big Brother! So professional! Sis is being very irresponsible~"
"GUH!!!!" Chika, pushed to the brink, grabbed Moeha's hand with her own wet hand and pressed it against herself. "At... at the start, just stay on the outside. Here... be gentle. Light friction feels best."
"Sis's body... is so hot."
Chika ignored her and continued the lesson.
"Then you can try using one finger... make sure your nails are short. Go slowly... you're still a— wait, not too hard, not too deep..."
"Eh? Sis isn't a virgin? Do you have a boyfriend?" Moeha asked, playing the part of the shocked sister perfectly, even though she had seen Rin take Chika's virginity with her own eyes.
"I..."
Chika looked at Rin and Kaguya for help, her eyes pleading for a cover story. Kaguya thought for a moment and put on a look of smug superiority.
"Because your sister is a sow who craves pleasure above all else. She's the cancer of the Earth. To chase the feeling, she broke her own seal of purity with her own hands."
"Eh? Sis is... a sow?"
"Woo... yes." Chika wanted to argue, but she couldn't admit it was Rin, so she had to accept the title with tears in her eyes.
"In that case, it's okay if I use a bit more force, right?"
Moeha blinked. Before Chika could answer, Moeha suddenly hooked her fingers inside. Chika's waist instinctively arched off the sofa. One finger, two fingers, three fingers... Chika's body, already developed by Rin, easily swallowed Moeha's three slender fingers.
Moeha wasn't an expert, but her clumsy, frantic digging was enough to make Chika's toes lock. Chika gripped the sofa cushions, unable to stop her sister or even cry out, as every attempt to speak turned into a lewd moan.
"Moeha, hands aren't the only way to make a girl happy," Kaguya said, still filming. She glanced around, her own skills with her tongue being legendary among Rin and the Hayasaka women. "A flexible tongue can provide an even better experience."
"Is that so? I'll try it then~"
"DON'T...!!!!"
Before Chika could realize what Kaguya was suggesting, Moeha had already ducked her head down.
Slurp~
"GUH-EEEEE?!!!!!"
"Haa... huff... haa... huff..."
Though a novice, under the guidance of Rin and Kaguya, Moeha had driven Chika to a spectacular, messy finish. The sofa, the carpet, and even Moeha's face were covered in Chika's cream.
Chika lay on the sofa, gasping for air, her blue eyes staring vacantly at the ceiling.
"Thank you, Kaguya-chan, Big Brother, for the guidance~ I learned so much today that they don't teach in school... Sis is delicious too~ Slurp~" Moeha licked the remnants from her lips.
Chika finally regained her senses and glared resentfully at Kaguya and Rin.
"It's late, we should head back," Kaguya said with a smile, pulling Rin toward the door.
Chika didn't stop them. She was starting to realize something... her sister might be mischievous, but she wouldn't normally humiliate her sister like this in front of a man just for fun.
"Moeha, when did you meet him?"
"Eh? What are you talking about, Sis? Today was our first meeting... Ow! That hurts!" Moeha rubbed her head after Chika flicked her. She stuck her tongue out. "Actually, I met him a while ago when I went to play with Kaguya-chan. We even made plans to go to a convention together."
"I... I'm going to take a shower!" Chika wanted to lecture her, but seeing Moeha's teasing grin, she couldn't maintain her "big sister" dignity.
Moeha didn't tease her further and went to wash her face. If she pushed too hard, Chika might actually get angry. Once Big Brother moved his studio next door, there would be plenty of opportunities.
Besides... Moeha pulled out her phone and looked at a contact name.
I really want to see her fall too~