Both

You spin around, briefly locking eyes with the Doctor before immediately falling to your knees, read to worship that massive girth that has been teasing at your cheeks for so long...

And your breath catches in your throat as your hands pull it free. This is the first time you've laid eyes on it, and it's fucking huge. You imagine it must be over a foot, thick as a baseball bat, and so hard it could give you a black eye if he swung the wrong way. Your sexual desire is momentarily interrupted by sheer terror at its girth, realizing what you've gotten yourself into, and you wonder if you should stop- and then a drop of precum lands on your lips, dripping from the titanic shaft that sways above you, and all your fears melt away in pure sexual lust.

It's immense majesty seems to completely eclipse your vision as the Doctor lowers it onto your face, the shaft covering one eye entirely as his hefty, powerful balls brush against your chin. You can feel his pulse through the veins in his thick rod as it dominates you completely, holding you in place like a dog with a treat on its nose.

You reach out your tongue and lick, tasting the salt of the Doctor's sweat and letting it swirl in your mouth as his musk invades your nostrils... Oh god, it's so good...

Your kiss his shaft tenderly at first, then ferociously, working your way up and down its length, licking every inch of it, slobbering against it as your hands massage his balls, worshipping every inch of your majestic master-

"Good." You look up and he's smiling down at you, his little fuckpuppet, desperately using every part of your body to please him as best you can - and you whimper in pleasure under his gaze.

You actually have to strain to guide his cock with your weak arms, but you push it down as you open your mouth wide, looking up at him with pleading eyes, practically begging him to turn your throat into his cocksleeve-

With a grunt, the head of his cock fills your mouth and you finally taste the smooth skin of his penis against your tongue, a heavenly flavor that makes your eyes roll back in your head with ecstasy. Your cheeks pinch in as you immediately begin to suck, tongue swirling over his cockhead like a cocaine lollipop, and when you hear him grunt in pleasure you go twice as hard.

He pushes against you, his powerful hips thrusting forward, and alarm bells sound in your head immediately as the monster cock pushes toward the back of your throat. Your hands instinctually grab outward, taking hold of the thick treetrunks of his thighs- and all panic subsides as you feel his masculine hand stroke your chin. Trying not to gag, you stare up into his eyes and see that gorgeous man, your master, so powerful, so commanding, so generous to let you please him-

And he thrusts forward again, his cock surging into your throat as you gag helplessly against it. In and out, he begins to thrust, gently at first, holding your head in both hands as he starts to fuck your face. Spittle coughs helplessly out of you as he abuses your hole, breaths only coming in between thrusts through your nose, in rhythm as Master allows you to breathe... but the rhythm is getting faster.

Helpless, you feel him piston in and out like an engine pushing to full, a machine designed solely to keep you subdued and submissive and with an open throat. Even as you struggle for air, your dick aches to cum, the power he has over you turning you on more than anything ever has.

As if reading your mind, his cock suddenly vanishes from your mouth as he pulls out, leaving you feeling empty, hungry, **** for more. You push your face back toward his massive girth, trying to lick it, to feel it again-

Master tilts your face up to look at him. "Stand and present."

Shivering at the command, you leap to your feet and spin, bending at the waist to push your fat ass out towards his crotch. You wait for him to take you, eyes closed... and wait. And wait.

You look back at him, eyes pleading - and see a cruel smile on his face.

"I want you to say it. Tell me you want it."

"Please, Master. Please." You want it so bad you practically moan the words, spit drooling from your abused lips.

"Tell me what you want."

"I want you."

Your word erupts in pain as a single hand delivers a powerful spank to your soft asscheeks. "Say it."

You look him in the eye and know this is where you belong. "I want Master to fuck me in the ass."

His throbbing cock, still lubricated by your spit, presses up against your eager asshole.

He leans into your neck - "Good girl." - and your world explodes in pleasure as he finally enters his most willing fucktoy.