Mitsuru had no idea that they had someone listening in and for the sake of Fuuka’s butt, she better hope Aigis doesn’t tell or the door opens. The spoon would crash down on the freshly installed bubble butt as she alternated between cheeks as she spanked

Aigis began to softly yelp after each smack with the spoon. Her bottom jiggled and rippled after every smack and definitely hurt more. She also isn’t able to kick from before since Mitsuru restricted her from doing such a thing. And even if she wanted to expose Fuuka, she was rather more focus on the spanks than on the girl.

Mitsuru watched as the butt gained more and more color as she showed no remorse in spanking the robot girl. “Now tell me what will happen the next time you decide to do something naughty?”

With her backside getting spanked and trying to endure it, Aigis almost missed Mitsuru’s question. "I will get another spanking Mitsuru-san." she replied as there was a hint of her voice almost cracking as if she was near tears.

Mitsuru nodded as she decided it was time to kick things up a notch and began spanking her sit spots, knowing that should be an extremely sensitive spot for her as well

Aigis’ yelps increased as she now felt her sit spots getting spanked now. She made note about that spot being the most sensitive when receiving a spanking. At this point, a few tears fall down from her eyes as she was slightly crying.

“I want you to remember this lesson for a long time so we don’t have to repeat this.” Mitsuru said as she kept at the sit spots, ignoring the tears as they’re common whenever she spanks someone. Especially the girls. Meanwhile, Fuuka’s jaw was on the floor as she couldn’t believe this was happening. And I’m the only thing that’s saving her butt right now is Aigis

Aigis sure is going to remember this even though she doesn’t want to right now. Her butt is already sore and if what Mitsuru say is true, she would have a hard time sitting down as well. This 'upgrade' is going to be hard to get used to even though it makes things fair for everyone else.

After a few more spanks, Mitsuru looked over the rear and was satisfied that that the rear and upper thighs were a crimson red. “Did you learn your lesson? Or do you need more help?” She asked, rubbing the spoon against the sore butt as she awaited her answer

Aigis sniffled as Mitsuru stopped spanking her. While she doesn’t look over her shoulder, she knows that it’s most likely red by now. "I’ve learned my lesson Mitsuru-san. I won’t intrude in another spanking again." she replied as she tensed a little bit at the spoon rubbing against her sore butt.