Happily!

Myra closes her eyes and snickers to herself.

She lets out a sigh and looks at you, saying "You must be a natural born ****, huh? Never in my career has anyone willingly asked for even more punishment. You know what? I think this earns you a special treatment. Stay right there for a sec..."

Myra goes off to one of her tables to grab something. You are extremely excited that she responded positively to your request, and patiently wait for what she has in store for you. Myra quickly comes back with a black leash, swinging it around as she comes closer. When she finally comes back, she connects the meter long leash up to your collar and tugs on it, making you move closer to her.

Myra then says "That's a good dog. Come on now, follow mommy."

Myra starts walking over to the table that you were strapped to just a minute ago. You follow her, always right by her side as the considerably short leash keeps you close to her. She tugs on it every now and then, making sure that you don't stray too far.

When you both finally make it to the table, Myra grabs the table control remote and after a few button pushes, turns it into a sort of chair, or more like a throne from where you're looking. She lets the leash a bit looser so that she can sit on the chair, facing you while you remain on your hands and knees facing her. You stare up at your master and await her commands.

She looks down at you, still holding the leash connected to your collar in her left hand and says "I'm going to give you something I don't give to many people. A chance to pleasure me in a more "direct" way, than you've been doing so far."

You wonder what she has in mind, but you quickly get a good idea when she opens her legs wider than usual, letting her 6-inch soft cock flop out between them. You stare at it intently and wait for Myra to say something.

"Go ahead, lick my cock like the dog you are. Not many people get this chance, so enjoy it." She says, tugging at the collar and bringing you closer.

Your face beams in happiness as you finally get to taste Myra's dick. This is something you wanted to do from the very first time you saw her, and after her relentless punishments, you finally have the opportunity. You stick out your tongue and bring it closer until you finally touch her skin. You start sliding your wet tongue up and down her shaft, looking at her beautiful cock as you do. Slowly, it starts growing bigger and bigger as it gets erect. After a few more licks, Myra' shaft is fully erect, standing 9 inches tall and a good 3 inches thick. You gawk at her size and start licking more intensely. Slapping your tongue all over her length. You move your mouth closer to her tip and taste a bit of her precum. It's as sweet as honey, but with the familiar bitter aftertaste of semen. You keep slurping over her tip and shaft for a few more minutes until Myra stops you.

She says "Enough licking, get that mouth to work my little ****."

You obey Myra, put your hands on your knees and lean higher to reach her dickhead with your mouth. You purse your lips and place your mouth up against the tip of Myra's cock. Losing patience, Myra yanks your leash closer to her, making your head go down on her dick, about 3 inches to be exact. This takes you off guard, but you don't resist. Your jaw stretches open pretty wide to accommodate her girth. Your tongue stays in your mouth, gliding across her tip, still letting you lap up her precum. Sensing Myra's lack of patience, you start bobbing your head up and down her shaft, giving her the best blowjob that you can. You hear a slight moan escape from her mouth, giving you a good idea of how well you're doing. Once you work around the first half of her length for a while, you start wanting to go deeper. You stick your tongue out form the bottom of your mouth and start sliding Myra's cock in your throat. When her dick hits the back of your neck, making you gag, she let's out a much louder moan and tugs on your collar even more. You keep going down on her until you reach a somewhat comfortable 7 inches of depth. Taking anymore is a bit too uncomfortable for you, at least for now.

You spend the next while blowing Myra's cock increasingly faster and harder, even getting your hands in on the action. You go from massaging her balls to stroking her shaft and sucking on her tip as you try to give her the best experience you can. Her moans get increasingly louder and more frequent as you suck her off. Myra keeps wrapping the leash around her hand more and more, slowly forcing you closer and closer and giving you fewer opportunities to catch a break. You don't mind, and even take it as a compliment that you get to pleasure her even more. Her cock is hot and you can feel that her balls are churning up a big cumshot just for you. You just can't wait to taste it!

After a few more minutes of intensely pleasing Myra, she grunts and says "Nngh... You really love sucking cock, don't you? I gotta say, I don't regret taking you up on your offer for one second. Ughh... I hope you're ready to get your reward, cause it's coming..."

You, now excited that Myra's close to cumming, start blowing her more intensely, getting your hands out of the way and just bouncing your head on her mast. Up and down, up and down, you gargle on her length as Myra's dick stretches out your throat inch by inch. You hear her breathing pick up and her cock tensing up, letting you know that she's almost there. Suddenly, Myra takes the leash holding you down and starts wrapping it around your head and behind her butt, practically forcing you down on her entire length. She pulls it as tight as she can, forcing your face right up next to her belly as her cock goes as deep as it's ever been in your tight little throat. Your tongue neatly sticks out the bottom of your mouth and starts licking her balls, feeling the large amount of cum stored inside. She holds you down for a few seconds, letting you soak in your position - being an obedient cock sleeve to your master. You start gagging and ****, but Myra doesn't loosen her grip for one second. She starts slowly bucking her hips into your face, even though there's already almost no space in between. However, that's enough to make her finally orgasm.

Myra let's out a loud yell as you feel her massive dick twitch in your throat canal. Then, her balls tighten up and she blasts forth a giant stream of jizz straight down your gullet. You obediently swallow her big load of cum, letting it splash in your stomach. Your throat gets quickly hit with another massive blast of cum, but you swallow that as well. More and more globs of sperm spew out of Myra's dick as she milks her dick in your mouth for two whole minutes straight. Some of her nut manages to leak out of your mouth and nose as it overfills your oral hole. After Myra finally lets out her last grunt, accompanied by a small spurt of semen, she lets go of the tightly strained leash and slumps down in her chair. You pull yourself off of her girthy dick and take a well-deserved breath. You lick up any cum still on her dick or around it. It tastes just as sweet as her pre-cum, but with a more distinct metal aftertaste. You gulp it down with great pleasure and slightly shake from pleasure as her seed slides down your gullet. However, you stay put, not wanting to leave your master's side just yet, or at least until she allows you to.

After a few second long rest, Myra looks back down at you with tired eyes.

She smiles and says "Good job pet, you make mommy proud. Now go run off, I'm sure you have other things to get to."

Her voice is much sweeter than when you first met, giving you a warm feeling. She reaches her hand down and clicks the leash off of the collar. You remove the collar and put it by her side for her convenience. You get back up, although feeling a bit weird, and walk over to your opened room door. As you step inside your room, you can't help but feel a bit saddened that your time with Myra is over, but you also feel liberated, now that you're back in control again.

As you get ready for bed and put on a new uniform, the speaker in your room turns on and you hear Alan speak to you.

He says "Hey bud. That was one hell of a test, huh? I still don't understand why the hell you wanted more from her, even after all the things she did to you, but I guess I won't judge you if you're into that. Anyway, we got a bunch of useful info on you and Myra alike, so this impromptu test was somewhat useful. Anyway, see you in another test tomorrow, good night for now."

As the speaker dies down, you finish preparing for bed and go straight to bed. When you wake up in the morning, you feel fresh and ready for a new test!

You got the "Good dog" ending with Myra.