Night. After dinner, it was Monday tomorrow. After dropping off the girls who had received their proof of friendship one by one, Ito Rin returned home. It was already around ten o'clock at night.
"Welcome home~" Nanami, who was practicing voice acting in the living room, stuffed her tiger plushie behind a cushion. "Um... Aoi said to tell you to go to her room when you get back." "Okay, I got it." Although he agreed verbally, Ito Rin was a bit puzzled. What kind of matter required Nanami to specifically relay it? And the system daughter hadn't sent any messages... Had Aoi finally given in after holding back for so long? Ito Rin suppressed a smile and said, "I'll go over now."
Arriving at Aoi and Rin's door, Ito Rin looked up. The living room on the first floor was pitch black, with only Aoi's room lit up. Both of them should be in Aoi's room. He took out the key, opened the door, and walked through the genkan. Just as Ito Rin, with light steps, was about to go upstairs to see what they were planning to do...
"You're back." "Oh, crap." Rin's slightly cold voice drifted from the darkness. Turning his head, Ito Rin vaguely saw a figure sitting on the sofa, illuminated by the moonlight. After seeing Ito Rin jump in surprise, Rin used her phone to turn on the living room light. Rin, wearing thin shorts that revealed her long legs and a short-sleeved T-shirt, stood there prettily.
"Why were you keeping the lights off...?" Pat Ito Rin lightly slapped Rin's butt. As he got closer to her, Ito Rin smelled the scent of shower gel, and... from the feel just now, Rin wasn't wearing underwear under her shorts, and two aroused points were visible through her T-shirt. "What are you planning?" "Today, Aoi and I went to see Eriri, Misaki, and Umimi." "What did you talk about?" Ito Rin asked curiously. The system daughter had told Ito Rin about them going to see Eriri and the others, but she hadn't told Ito Rin what they specifically discussed.
"Today, Eriri and Aoi said you were being targeted..." Rin roughly told Ito Rin what had happened today. Umimi wanted Rin to cosplay Shizuku, and under Rin's persuasion, Umimi also agreed to cosplay together. The two weren't going to Comiket, but just cosplaying for fun at home. Besides that, Aoi also wanted to lend him to Misaki and Eriri to experience the plot from Kashiwagi Eri's doujinshi.
"Good heavens…" Ito Rin laughed wryly. Was this a task from his System Daughter? Or did she want to do it herself? But… Aoi, Misaki, and Umimi had only met him once. Although under the 'guidance' of his System Daughter, Aoi had developed a bit of interest in such matters, Aoi's personality wouldn't make her that proactive. Then the only remaining possibility was Eriri… holding a grudge! Based on Ito Rin's understanding of Aoi, her pettiness was not as big as her chest. Last time, Eriri asking Aoi to wash her pants or something probably genuinely angered Aoi.
"So… Aoi specifically asked me to come over just to tell me this?" Rin shook her head, "Come with me." Under Ito Rin's puzzled gaze, Rin led him to the door of Aoi's room. She pressed the doorknob, but Rin didn't open it immediately. Instead, she paused for a moment before forcefully pushing the door open.
"Ta-da~" Rin spread her hands and gestured for Ito Rin to enter. Following Rin's gaze, he saw Aoi sitting on a chair facing the door. She was wearing the same short-sleeved, short-pants loungewear as Rin. Although she, like Rin, wasn't wearing a bra and her nipples were faintly visible, she had some additional items on her body. Two black over-the-knee socks tied her legs to the two chair legs, and her hands were raised above her head, tied behind her back, revealing her smooth armpits. Ito Rin could faintly see a pair of fleece-lined handcuffs behind her head, binding Aoi's hands to the chair back. In addition, a gag also plugged Aoi's mouth, making her only able to drool and make whimpering sounds… Ito Rin found this gag very familiar. Wasn't this one of the 'reference materials' Mashiro bought before? It was certainly being put to good use.
"Punishment," Rin said calmly. Ito Rin looked at Aoi, who was firmly tied to the chair, with a smile. "How did you offend Rin again? Or did Rin catch you masturbating to my voice again?" "Wuwuwu!!!" Aoi struggled to speak, but with her mouth gagged, she could only let out some moans.
"How do you want to punish her?" Ito Rin leaned close to Aoi and lightly scratched Aoi's smooth, hairless armpit, causing Aoi's body to twist. The wooden chair let out a grating squeak. "Punish her like this." After saying that, Rin kissed Ito Rin's lips. Her soft, white breasts, a size larger than Aoi's, pressed against his chest. Her soft, slippery tongue pried open Ito Rin's teeth, greedily sucking the saliva from his mouth with smacking sounds. Her hands gripped Ito Rin's wrists, guiding his hands to her chest and below.
"Wuwu!!!!" A short cry of despair escaped Aoi's mouth, but it wasn't because her younger sister was getting intimate with her boyfriend, but rather…
[Ding~ Limited-time mission.] [Mission content: Reach orgasm before Ito Rin and Hoshizuki Rin finish.] [Mission success reward: One bottle of Empathy Potion.] [Mission failure penalty: Unable to reach orgasm for 7 days.] The mission itself wasn't a big deal. Reaching orgasm by masturbating while Ito Rin and Rin were doing it was commonplace for Aoi. Even if it changed from watching the Camera System to a live broadcast, she would at most be a little shy. But the problem now was… How am I supposed to reach orgasm when I'm tied up by them!? Forget masturbating, my legs are tied to the chair legs, so I can't even rub my legs together… Isn't this a guaranteed failure mission? Didn't the System say it wouldn't give guaranteed failure missions?
[That's other systems. This System has never said such a thing. However, this mission is not a guaranteed failure mission.] Then how am I supposed to complete the mission in this situation? [Please use your imagination, Host.] Use my imagination? No matter how much imagination I use, Rin isn't going to untie me today, is she? Do I have to beg her? My mouth is gagged now, so even if I wanted to beg her, I couldn't! [This System means that the Host can use imagination to reach orgasm through mental imagery. This System has said all it can. Please comprehend it well, Host.] …Aoi wanted to speak but hesitated. Comprehend my ass! Reach orgasm just by imagination without actual contact? How is that possible! However… looking at Ito Rin and Rin embracing, Aoi had a bold idea. She had masturbated so much before that she subconsciously thought orgasm could only be achieved manually, but the System only said to reach orgasm, it didn't limit it to not letting him and Rin do it. If they helped, wouldn't it be easy?