Angrily!

Without saying anything, Myra winds back her foot and kicks you in the side of your torso, making you fall off balance and tumble to the floor a few feet away. You pick yourself up, still on your hands and knees, trying to convince her that you're an obedient little dog.

She looks over and says, with a raspy tone in her voice "What the hell don't you get? If I say we're done, then we're fucking done. If you wanna be a disrespectful little ass, then you're gonna get treated like one. Crawl back over here, NOW!"

You feel bad that you've upset your master, but you crawl back over to her obediently. When you reach Myra again, she wastes no time and delivers another powerful kick to the spot again, sending you flying even further than before. You let out a slight grunt from the pain, but you keep your composure for the sake of Myra.

She speaks again, with the same hint of anger as before "Dogs like you never learn after just one punishment, do you? Well, we gotta teach you to behave somehow. Now get back here!"

You instantly get back up and crawl straight back to her, no matter how hard your pride is hurt by it.

She stares down at you and says "Turn around!" while pushing your head away from her with her foot to get you to turn around faster.

You comply and point your butt at her direction.

You turn your head back to get a look at what she's doing, but are quickly greeted by her screaming "Don't fucking look at me, mutt!"

You quickly shoot your head back straight and look down on to the floor, being as submissive as you can. You can hear Myra spit in her hand and start rubbing something. Judging by how this is going so far, she's most definitely planning to take you in the ass, which is something you're not too saddened by.

After lubing up her dick with her spit she says, in the same commanding voice as before "Now spread your ass as wide as you can for your mistress."

You lower your head down to the floor and use your hands to get as close to your asshole as possible and stretch it open with all of your strength. You get it a solid inch wide, and you hope that it's enough to please Myra.

Suddenly, you feel two hands grab onto your thighs and a powerful thrust send a cock plundering down your ass. You yelp out of the pain but quickly compose yourself. Myra managed to shove her entire 9-inch long rod down your hole with a single thrust. Your body shivers from the pleasure of the newly found appendage pressing against your prostate. Myra lets out a little moan as she penetrates you but somehow manages to keep a straight face. Before you can get used to the dick lodged in your rectum, Myra pulls it out almost completely before sending it back inside. You let out another moan of pleasure and pain but accept your fate. Myra winds back again and thrusts inside you once more, quickly gaining tempo as she continues. Only after a few minutes, she's pounding your guts at her fastest, making you moan out loud with each thrust. Her sex approach is somehow more painful than most of the other dicks you've taken, therefore making your moans a bit louder.

After painfully crushing your ass for about half an hour, Myra decides to get a bit kinkier. She uses her hand to grab a fistful of your hair and drags your head off of the ground, still pounding your hole. The hair pulling hurts like a bitch, but you accept it like the whore you are. She pulls your head up so that it's on the same level as your ass.

She then yells "Bark, mutt!" and tugs on your hair.

You whimper but then start imitating something that sounds like a sad puppy.

Myra yanks your hair even harder and yells again "I said BARK!"

This time, you gather up your strength and let out a fairly convincing dog bark. She seems pleased for now but keeps your head lifted off of the floor, keeping a hard grip on your hair. After a while, she yanks your hair again and you instinctively let out another bark.

Myra laughs somewhat menacingly and says "Good dog, just like that!" and pulls your hair again, making you bark again.

This goes on for another 30 minutes until Myra forcefully drops your head back onto the floor, gets a hold of your ass and REALLY starts going to town on your ass. The **** prostate stimulation you've been receiving has got your dick fully erect and dripping precum for as long as you can remember. The sound of slapping skin and loud moans is fairly dominant in the room. Every so often, Myra slaps your ass with her latex gloved hand, leaving a bright red mark. After over a dozen slaps, the mark gets more prominent, and soon enough, your whole ass gains a red tone. The pain and domination make you even more submissive as you give yourself up to Myra's overpowering presence. You hear her moan more frequently than before and feel her speed increasing, meaning only one thing...

After a few more minutes of intense thrusting, Myra lets out a loud grunt and pushes her hips as close to yours as she can. She holds on tight as you feel her cock start pulsing and her balls tightening. Suddenly, out of her monstrous dick out comes a giant stream of semen, quickly filling your insides with spunk. The pressure on your prostate is enough to send you over the edge as well, making you shoot a comparably tiny load of cum on the floor. After your own orgasm has ended, Myra still spends a solid minute pumping you full of her jizz. When she finally seems done, she lets out a long breath and pulls her rod out of your ass, making a stream of cum flow out of your quivering sphincter. You lay on the floor, defeated and thoroughly disciplined by your mistress. Before standing up, Myra wraps her hand around the collar strapped to your neck and rips it off.

She stands up, looks down at your limp body and says "Maybe next time you'll follow orders like you're fucking supposed to. Take this as a valuable lesson. Now get the hell out of here dog."

She kicks your limp body around on your back, and you get a good look at the person who just dominated you. You don't want to piss her off anymore, so you quickly stand up and limp over to your room, cum still dripping from your anus.

After cleaning yourself off and grabbing a new uniform, you collapse in bed from your punishing test today. Before you can doze off to sleep, the speaker in your room lights up and out comes a voice of Alan.

He says "Well, ain't you one to take a punishment. Weren't her planned activities enough? I mean, I admire you for even walking away from something like that, that takes resilience. Anyway, the test was a pretty big success. A lot of useful info was gathered and everything turned out fine. We'll be seeing you bright and early tomorrow, but you've earned a good nights sleep!"

The speaker shuts off and you can finally get some peace and quiet.

You got the "Sucker for pain" ending with Myra.