Markus sits strapped to a chair in a cold and unwelcoming room. All around him, on the walls, various torture implements hang, ready to show off to any unfortunate soul who finds themselves the primary guest of this terrible place. However, it isn't whips and chains that are on display here, but rather the form of the one providing the torture. 
Standing before him with her head no higher than his chest in his seated state is a goat-like creature with eyes that burn with a passion for pain and manipulation. Large horns curl up from her forehead, and leathery, bat-like wings drape over her shoulders. Huge, floppy ears drape down over those wings, looking like ceremonial tassels. Through yellow eyes that slit vertically, she seems pretty uncanny. However, her broad hips and her enormous tits show off more about her than the other demonic traits could ever do. She dresses in accessories and sleeves, but they do not cover her upper body. Instead, she only has garments that support but keep exposed, her voluptuous breasts.

"So," the demoness begins, stepping up with a hoof onto a small stool before Markus. "Why don't you be a good boy and tell me all about your milk mage mistress, hm? Where does she get her power? How does she use it? I'm very interested in learning all I can about her, but she's just so mean to me," she says with a pout, fluttering her eyes at him.

Markus turns up his snout at her and huffs. "Listen here, you half-sized hellspawn: I may be many things, but a backstabber isn't one of them!"

"Ooh, you have such dedication to her, but do you think that Lactania has total loyalty to you?" the succubus asks, stroking a long-nailed finger along his thigh. "After all, if something bad happens to you, then she's free to be the queen bitch she used to be instead of babysitting you. Then, if you're locked up in here and she joins us, you'd be stuck forever for the whims of my master."

He growls, gripping the arms, his eyes narrowing.

Snickering slightly, the succubus kicks the stool closer to the chair and steps up to it. She then trails her finger down along her collar and around the mound of her breast. "But if you tell us everything we need, I'll give you a perfect gift." She squeezes the tip of her mound, just around her areolas. Sweet milk pearls up at the nipple, the droplet forming and quivering. "Did you know that a succubus has an unlimited milk supply?"

Markus's eyes lock onto the pearl, staring transfixed.

"The tales say that you made Lactania fill an entire room with her milk. With me, you could fill a palace."

Markus gulps, squirming in his chair slightly.

The succubus leans in, her free hand lifting that large mound closer to his lips. "Go ahead, lean in, taste. You'll enjoy every drop for all eternity, for sure."

Markus's eyes cross as they stare at that proffered breast, but then they lock in on the succubus's face. He spreads his mouth wide in a smile, ruefully filling his face as he barks a hearty laugh at her.

This makes the succubus step back, nearly falling off her stool. "What!?"

"Hah! You honestly think I need a limitless supply of milk?" Markus says, rocking back and forth. "Lactania's plentiful breasts are more than enough for me, and there's nothing you can do to change that!"

The succubus hops onto her stool, clenching her fists and stomping her hoof. "Oooh, you disrespectful mortal! How dare you laugh off my gift!" She wrinkles her nose, her ears bristling. "Oooh, you'll regret this. You want milk, huh? Then, I can give you milk. Milk so much you'll drown in it if you don't talk!" She says this, gripping her tit and grabbing him by the back of the head, wrenching him forward. "Now, then, either you're gonna gulp this down, or it's gonna go down into your lungs. Either way, I'll have fun for certain."

Behind her, the door to the room slowly opens, and Lactania's large hand slowly pulls the portal toward her. She smiles at Markus and gently, tentatively, tiptoes toward the short succubus.

"What's the matter?" asks the demon, shaking her chest, pressing his lips right up against that tit. She squeezes her breast, spilling the sweet and hellish substance over his lips, dribbling it down his chin.

The seducer laughs, shaking her hips and bouncing on her hooves. "Ooh, once you open up, you'll never stop." She cackles, her impish nature shining through.

But that's when large hands reach from behind her, and massive breasts, sticky and wet, press against her back.

"Oh, baby," coos Lactania. "You really put yourself in a bad position. Markus, be a dear and show her just the mess she got herself into."

With that, she pushes the demon forward, pressing together both tits so that the nipples squish together.

That's when Markus takes his opportunity, wrapping his lips around both teets and suckling. His tongue lashes up and down, back and forth along the nips, stimulating them, making them stiff.

"A… ah… n… nuh... No! Let go of me! This is supposed to be his torture! You can't just, aaagh!"

Lactania shuts the succubus by massaging those milkers, sending warm, tingling milk streams onto Markus's tongue.

The dragon laps and suckles, coaxing more liquid from the succubus's bust.

The demon dangles, held up by Lactania, and presses to Markus, kicking her hooves in a sad attempt to escape. But she cannot escape, as she is squished between these scaled wonders, left to gasp and groan as Markus sucks and sucks and sucks and Lactania squeeze and squeezes and squeezes.

Markus's eyes latch onto Lactania, and Lactania coos, patting him on the head. "I'm glad I could find you," she says. "Now, let's finish this and get ourselves out of here, hm?"

And Markus, his mouth complete, lets out an enthusiastic, "Mmm-Hmmm!"

The succubus squirms, pushing herself away from Markus, but Lactania keeps her pinned up against the two of them.

The milkmage brushes her fingers over the demon's hair. "Oh, no, no, no… you wanted Markus to drink but didn't understand what that entailed, did you?"

With that, Markus suckled, closing his eyes, savoring every sweet drop of the slightly smoky solution. "Mmmmph…"

"You were correct when you said that he would be able to milk me dry, but you didn't realize that he has no limit in his desire for dairy.”

The succubus's hooves kick around uselessly as she dangles between the two, struck between their chests and the tight hold of the milk mage. "Puh - Please… have mercy! I am only doing as I was told! Don't suck me dry, oh dragon!"

Markus's glance turns toward Lactania, wide and curious but also devious.

Lactania smirks back at him.

Markus's suckling goes faster and harder, taking more and more demonic milk into himself, filling his belly with the sloshy white goodness of a mother's delightful drink.

Bleating, the succubus thrashes around. "W… wait! I can to-tell you, ah… all about my, ugh, boosss!"

"Better be quick," Lactania coos. "Markus can do this all day if need be."