Yes

To your horror as he runs a finger along a shelf Slut had supposed to have dusted... The finger comes back with a layer of dust on it...

"Ah ha! A dusty shelf! Who was responsible for cleaning it?"

He looks at the two of you; clearly curious as to what your response will be...

"It was me, sir." Slut responds.

"So **** had nothing to do with this shelf?"

"No, sir, she did not."

"It. It did not, Slut; correct terminology please."

You shudder with pleasure at being referred to as an it.

"Sorry, sir."
"Did you not check your cleanliness?"
"No, sir, we were checking each other's work..."

"So you lied? You told me she had nothing to do with the shelf; when you just told me that she should have checked it after you cleaned it..."
"Oh, no sir, I didn't lie! We were checking each others work but it didn't have chance to check my work before you arrived."

"You still lied and now you have the audacity to tell me I'm wrong? You will soon learn respect; seems you need stronger discipline to remind you to be respectful, and on top of a punishment for not cleaning properly! You will be in pain tomorrow."

You are stunned at the tomorrow declaration of his sentence...

"And you, ****, did you clean everywhere correctly?"
"Yes, sir."

"Let's check, shall we?"

He continues his check; eventually arriving at the area you cleaned at the same time Slut cleaned the shelf; neither having been checked by the other...

He makes a show of checking every square-inch but he finds nothing; you were thorough...

"Very clean..." he mutters.

You continue crawling around with Slut and your Master; him getting more and more frustrated at not finding any of your failures...

"Fine. You did well ****. But you will join us tomorrow for that appalling shelf. Then you can watch as poor Slut is punished for it's behaviour today."

That evening you sleep in the cage, wondering why you weren't punished that night... Until your mind goes too your newest rule; full healing the following morning... So your Master had adapted... Now he punished in the morning so you felt the effects throughout the whole day... It was cruel but you somewhat understood the advancement... You hear the door open at the top of the stairs as Slut is brought down by Master; having just had sex with each other...

He locks it in it's cage before heading upstairs; stopping at the top.

"Goodnight; you two. Sleep well. Busy morning for you both..."

You hear Slut sob; knowing her double punishment would be incredibly severe...

You reach down to the notebook; ready to write a new rule...

Rule: ****'s are **** to watch other slaves be punished as part of the punished ****'s discipline.

Rule: I am allowed to punish other ****'s part of my Master's household as a reward for doing good work.