The rest of the day passed pleasantly. Marsha was getting used to the plug being buried inside her arsehole. We asked Master and Marsha what limits they wanted us to respect and they said "None," but we pointed out that you need basic limits like no underage and no drugs. They realized how important that was and readily agreed.
Mistress asked Marsha "How are you doing girl?" Marsha responded "It is all so much to take in, but I am honestly loving it all."
Mistress asked "Are you ready to try to push your limits of pain?" Marsha was terrified of Mistress' words but the thought of pushing her limits excited her. "Yes Mistress, please can we go deeper?"
Then Madame asked Bob "Coming from a vanilla world, this must be overwhelming. How do you feel about pushing Marsha's limits now?" Bob said "I am indeed overwhelmed, but I am so pleased that Marsha wants this. Honestly I was confused at first, but now I am excited by this new side of Marsha. Yes Madame, let's push Marsha."
Mistress said to Becca and myself "Go out in the back girls. Test positions." We never hesitated went outside and stood up with our legs spread wide and hands submissively behind our heads. "Marsha go stand with the girls in the same position."
Then she explained to Master and Marsha "Slaves will sometimes be tested to prove they are strong enough to be pain slaves. Usually once you hit a certain age, the testing stops, but I want Marsha to see how the testing is done before she submits to it. Here is what will happen. Madame and I will stand in front of our slaves and then brutally kick them as hard as we can between their legs. The girls can scream, double over in pain, grab themselves, puke, piss or even shit themselves, but they will not allow their knees to touch the ground. If they do they are dismissed never to serve again."
Bob said "That seems harsh." Mistress said "It is harsh, but the BDSM kinky world we have chosen is just as harsh. It is better to weed out the weak ones before its too late." Then she turned to Marsha "We can stop the testing now and go back to the way things were. It is your decision slave." Marsha lowered her head in submission "I am ready Mistress."
Madame stepped in front of Becca, ready to kick her cunt. Before she did she said "Mistress Nancy knows that both Becca and Julie have been tested dozens of times and always passed. This time we want to make it more challenging for them. Girls take the plugs out of your asses and put them in your mouths. The test will be different this time. In addition to not allowing your knees to touch the ground, we have decided that you must keep the plugs in your mouths as well. If you drop the plugs, you fail. Understand?"
Becca and I looked at each other and then nodded. The plugs had not been out of our arses for quite a while so I had Becca bend over and pulled her plug out and then she did the same for me. As expected the plugs were filth covered in shit and sweat, but we never hesitated and put them in our mouths.
While we did that, the Dominants took off their dresses and stood there in just knickers, bras, stockings garters and heels. They unhooked their bras so as Mistress said "The 'girls' can get some fresh air." Then they stepped out of their heels.
Bob asked "Why did you get undressed?" Madame said "This way we can move our legs more freely and get more into our kicks. As to why we took off our heels, you have to remember our slaves are pain sluts. They love being hurt like this. But as a responsible Owner you have to always make sure that while you hurt them, you never injure them. Kicking them with our heels on would likely inflict physical harm on the girls. That is something we will never intentionally do. We will hurt them, but never injure them. Do you understand Bob?"
Bob said "Thank you Annie, there is so much to learn. Marsha and I appreciate you showing us this."
Madame them smiled "As to exposing out tits, we thought you would enjoy that." With that both women playfully jiggled their tits in front of Master. The laughter from all of us helped ease the tension.
Then Madame turned to Becca and reached between her legs to rub her cunt. As expected she was wet with nervous excitement. Madame looked at Bob, go ahead dear, you can rub her cunt. Slaves have no expectation of privacy or modesty. When he rubbed my sister's cunt, she moaned softly around the nasty plug in her mouth.
Madame looked at Becca "Ready girl?" Becca nodded and the like lightning, Madame brought her foot up and kicked Becca so hard that she was actually pushed back. The scream from Becca was loud but muffled as she bit down hard on her the plug to keep it from falling out of her mouth. As she doubled up we could see piss running down her thighs as she lost control of her bladder.
Tears streamed from her eyes and she coughed hard and grabbed at her cunt. It was obvious that Madame did not hold anything back when she kicked her. It took a few moments, but finally Becca stood upright and placed her hands behind her head and stared at Madame. Madame simply smiled and said "Good girl."
Madame took the plug from her mouth and then handed it to Bob "Would you like to reinsert it?" Master nodded and lubed the plug said to Becca "Bend over slave." As Becca bent over she reached back and spread her arse cheeks cheeks wide apart lewdly displaying her arsehole. Master pushed his fingers deep inside Becca's bum and then pushed the plug back in place and patted her arse lovingly.
Mistress said "Julie get ready girl." Mistress reached out and lightly stroke my lady parts (balls). Then he said to Master "See how hard she is Bob. She is excited too. Go ahead rub her clit"
Master seemed to hesitate but knew he did not want to offend anyone and he touched my clit for the first time. He then started to stroke it, as he did I could not help but moan softly. It became obvious that Master was enjoying what he was doing. Mistress said "See Bob, Julie may have something 'extra' but she is a woman dear."
I noticed the lust in Master's eyes and knew he was starting to understand now. I smiled around the plug in my mouth. My words were muffled, but I said "Thank you Master."
I knew the women could never understand how much it hurt to have my lady parts kicked, but I nodded as Mistress asked if I was ready. Like Madam, Mistress held nothing back and viciously kicked me hard in my lady parts. I felt the pain travels from my lady parts to my belly as I doubled over and grabbed at myself.