Izumi Sagiri... so impressive! The girls had only one thought watching Sagiri drink so much.
"D-Do you feel anything? Does it hurt?" Maki asked nervously. Making an exit into an entrance... always felt a bit strange.
"Ugh... my stomach feels full." Sagiri gently rubbed her belly. Although Sagiri felt she had drank quite a bit, it was still far less than what they drank in doujinshi. It was impossible in reality to swell up like in the doujinshi to the size of a pregnant belly... that would be fatal. Sagiri's lower abdomen remained flat, showing no signs of being full, but soon Sagiri felt a sensation...
"N-No... I can't hold it, I need to go to the bathroom!!!!" Sagiri clamped her legs together and took a step, but Rin Ito grabbed her wrist. Then, Rin Ito took out a small plug from his backpack.
"....?" Sagiri, having read a lot of doujinshi, naturally knew what this meant: plug it after filling, similar to the edging she had experienced before.
"It's okay if you can't hold it, I'll just plug it for you... Since you're friends, you should stick together. Didn't boys and girls in school always arrange to go to the restroom together during breaks?"
"Exactly, exactly." Megumi Jinno, Ami, and Maki frequently echoed him. "In school, everyone goes to the restroom together."
Sagiri glared fiercely at the three of them... They would get what was coming to them later! Sagiri carefully raised her butt.
"Ah..." The touch of the cold metal made Sagiri let out a small yelp. Sagiri couldn't relax; instead, she had to clench tightly. Only by doing so could she avoid revealing anything in front of everyone. However, the strength of Sagiri's butt muscles was certainly no match for Rin Ito's hand. After passing the widest point, Sagiri seemed to swallow the plug with a 'pop.'
Aside from feeling the need to use the restroom, there wasn't much discomfort. Sagiri snatched the syringe from Rin Ito's hand. "I'll feed them!"
"Ugh!"
"Gulp!"
"Eek!"
Megumi Jinno, Ami, and Maki were all lying prone on the ground, their three butts raised in a row. All three girls' muscles were tightly clenched due to nervousness. From Rin Ito's perspective, he could see all the girls' private areas, and in contrast to their slender waists, their slightly petite butts appeared more perky. Rin Ito was incredibly excited by the sight of the three in a row, but now was not the time to consume them.
Rin Ito also wickedly sucked the water to the very top, visibly more than Sagiri had drank, by about one-third. Sagiri was also rummaging through the backpack, helping Rin Ito find plugs to seal their leaks. After injecting warm water into them each time, Rin Ito took a plug from Sagiri's hand to seal the imminent leaks of the three. The three, their faces flushed, clutched their stomachs with one hand and their butts with the other.
"N-Now... can we go?"
"No~ Only one person gets to go to the restroom."
"Big brother?"
"What exactly do you want, you pervert!?" Maki, her face red with shame and anger, whined at Rin Ito. This feeling was incredibly uncomfortable. With their leaks sealed, they couldn't release anything even if they relaxed their muscles.
Rin Ito looked at Sagiri with a half-smile. "They bullied you just now. Don't you want revenge?"
Sagiri's eyes lit up at Rin Ito's words. It was like keeping a secret... The best way to keep a secret was to make the other person part of the secret too. Since she had been exposed and had shown the most shameful sight in front of them, it was only fair to make them show shameful sights too... Based on Sagiri's many years of understanding Rin Ito, they were in for it!
Rin Ito suppressed a laugh and took out two small chains from his backpack. Everyone looked puzzled, except for Ami, whose face turned pale...
"Huh? Isn't that the chain that connects to the collar? Big brother, are you going to make us cosplay cat girls like this?" Megumi Jinno was confused. She had looked in the backpack Rin Ito brought earlier but hadn't paid much attention. It was for cat girls, after all. They had also seen cat-girl cosplays at the convention this morning, all with chains connected to red leather collars.
But now it seemed... this chain had another use?
"Mister... that chain isn't..." Unlike the confused Megumi Jinno, Ami, who often read doujinshi, seemed to understand something.
Rin Ito lightly patted Ami and Maki's butts. The knowledgeable Ami immediately raised her butt. The utterly confused Maki also imitated Ami and raised her butt. Then... Rin Ito used the chain to connect the plugs on the two girls. Then Sagiri and Megumi Jinno.
"Ahem, ahem..." Rin Ito cleared his throat. "Only one person gets to use the restroom, so... let the tug-of-war begin."
"Pervert... Ah!" Maki's words were cut short as Ami gently pulled the chain behind her butt. This caused Maki, on the other end of the chain, to yelp. Sagiri also pulled the chain, making Megumi Jinno desperately cover her butt.
"Ami, Sagiri, that's cheating. You can't use your hands in this tug-of-war," Rin Ito cleared his throat and said seriously. "The loser loses everything, and the winner gets to sit on the golden toilet!"
Rin Ito then began to explain the rules to them. "The rules are simple. You divide into two groups, pair up, lie prone, and crawl forward. The first to let go loses. Then the winners from both sides will have a final match to decide who gets to use the toilet."
Gulp... Maki swallowed.
"Then... what about the losers?"
"Heheheh..." Rin Ito showed a villainous smirk. "The losers? The losers won't need to go to the restroom anymore the moment they lose."
Maki was only interested in cute cat girls, and Megumi Jinno was interested in naughty things. Neither was interested in the tug-of-war game. Only Sagiri, who was focused on revenge, and Ami, who wanted to see a real-life doujinshi play, were interested. But the chains were already attached. If they refused to participate, Rin Ito might just pull the chains the next second.
While Rin Ito was explaining the rules to them, Kaede was also watching everything in the bathroom through the camera system... He wouldn't make Suzu and me play this kind of tug-of-war game, would he? And then Mashiro and Nanami too? And Hinata and Saya. Kaede subconsciously swallowed. I definitely wouldn't be able to win against Suzu... I'd definitely spray everything out in front of Suzu.
Although the System could clean everything up, and there wouldn't be any smell or mess, still... The thought made Kaede's mind tremble. Is there any enhancement to make specific muscles strong, really strong? Kaede quickly checked the System Shop. There were enhancements to become sensitive and weaklings in her Suffering-Mistress Shop, but enhancements for strength were only in their Female-Harem-Master System Shop.
While Kaede was browsing the System Shop, the girls on the other side of the camera system were ready. The tug-of-war game officially began.