“So,” Nurse Redheart said. “What seems to be the problem?” She glanced down at her clipboard and blinked. “Something about overactive...mammary glands?”

“Ah. Yes.” Redheart looked back up to her patient. Rarity was seated rather demurely on the patient’s table, her hands clasped in her lap. Her forearms, though, cut deeply into the pair of oversized pillows resting against her chest. Rarity had always been rather...overendowed. That wasn’t why she was here today, though Redheart had taken her fair share of glances at the fashionista’s bouncing bust over the years. Today, though, the usually confident Rarity was all blushes and stammering. “You see, it’s a very...personal issue.”

“I can see that,” Redheart said, nodding. Rarity’s breasts were exceptionally large; if Redheart hadn’t seen the mare’s medical file, she’d swear that she must have gotten work done. Each one of Rarity’s tits was, paradoxically, plump and perky. Each sphere of globular titflesh was nestled perfectly against her chest—indeed, against her stomach for the bottom few inches. Her nipples, meanwhile, were a pair of protruding thimbles that no bra could reasonably contain. Today, though, they were swollen up to three times their usual size—and a small fountain of a milky-white liquid was dribbling out of each one. She couldn’t resist adding, “No doubt everypony can see that, I’m afraid.”

Rarity’s cheeks flushed. “Yes. No doubt.” Her knees knocked together, her fingers twiddling anxiously in her lap. Redheart just inclined her head and did her best to ignore the growing moisture between her legs. Rarity had always been an attractive mare, but this sudden outpouring of...well, what seemed to be milk was twanging one of the nurse’s most well-hidden strings. A drop of warm liquid streamed down Redheart’s thigh and she crossed her legs, hoping Rarity wouldn’t notice.

Pulling up her clipboard, she stepped forward and attempted to sound professional. After “inspecting” her notes—in reality, trying to push aside her mounting arousal—Redheart finally gave in to temptation and set her papers aside. Clearing her throat, she reached out toward Rarity’s freed bust with a twitching hand. “Ah. May I?”

“Oh, yes. Of course,” Rarity said. The stream of milk down her left breast redoubled, and she bit her lip. “If it would help you get a better idea…”

Redheart nodded, as much to steady herself as Rarity, then reached out and placed her hand on Rarity’s boob. It was warm to the touch, and seemed to throb gently in her palm. Sliding her fingers across its soft, sleek surface, she imagined she could almost feel the gallons of milk sloshing around inside of it.

“So,” she began. “When did this begin?” She gave Rarity’s breast a light squeeze, and nearly gasped when the supple titflesh squished between her fingers. Rarity opened her mouth to reply, but had to stifle a moan before continuing.

“Y-yesterday afternoon,” she stammered. “They just started dripping with this liquid—this milk, I suppose. I was a bit worried, at first, seeing as I’m not pregnant, but—oh, then I tasted it for some silly reason, and was sure. I wound up keeping them over a pair of bowls while I worked, but they were still leaking by the evening, and rather heftily, too.” Rarity bit her lip. “I tried to milk them before bed, but I couldn’t entirely, ah, control myself. I wound up doing something else entirely before bed, and woke up with soaked bedsheets.”

Redheart nodded sagely. She kept fondling Rarity’s tits, unable to keep herself from their smooth, rounded surface. The heat between her legs was growing, her cheeks growing subtly more flushed with each passing second. Ostensibly, she did have to inspect Rarity’s bust to find any kind of problem—but if she were being honest with herself, she had to admit that there were just the teensiest bit of doctor-patient misconduct going on right now.

Her other hand roamed down Rarity’s areola as her first softly caressed the curvy mare’s underboob. Rarity stifled another moan, the stream of milk from her breasts doubling in volume. Soon, Redheart’s fingers were drenched in a thick, creamy white; she lifted one hand to her muzzle and gave it a lick. The taste excited her.

On a whim, she bent forward and gave one of Rarity’s nipples a squeeze. A good-sized spurt of milk suddenly splurted over her face, covering her with Rarity’s cream.

“My goodness!” Rarity gasped. “Nurse Redheart—I am so, so sorry.”

“Don’t be.” Redheart licked her cheeks. She savored Rarity’s taste, and almost moaned as she swallowed her milk down. It was so warm, so creamy and sweet. Just like the mare herself, she imagined. “It’s to be expected, I’m sure.” She pulled herself back up to her full height and coughed, reaching up to adjust her nurse’s hat. “Now, it’s my medical opinion that you just need some assistance relieving the, ah, pressure your body has built up. Professional assistance, of course,” she quickly added.

“Oh, yes,” Rarity said. “Anything. Really, I’m happy to try whatever you might propose.”

Anything. Redheart’s fingers twitched. She licked her lips and swallowed. “And so I’d like to prescribe a professional’s...treatment,” she said, her voice slightly shaky. She reached out to Rarity’s right tit, her hands trembling, and took the curvy mare’s breast in her hands. She couldn’t help it—couldn’t control herself any longer.

“Nurse Redheart?” Rarity asked. She sounded like she was struggling, too. “What’re you—ooh.”

Nurse Redheart’s lips latched around Rarity’s nipple as easily as a foal’s. She clamped down firmly, though not painfully, and immediately began slurping down the stream of warm milk already pouring down Rarity’s pillowy bust. She continued to suckle at Rarity’s breast, gulping down cup after cup of milk. Her fingers weren’t idle either, though, massaging Rarity’s tit and squishing it between her palms.

Redheart gulped down the milk eagerly, massaging it out. She could feel even more sloshing in the depths of Rarity’s tits, just waiting to come rushing out. And more and more did come rushing out, a cascade of warm cream that splattered against the back of Nurse Redheart’s mouth.

Rarity just moaned. The haze of long-needed release filled her voice as Redheart’s medically-trained hands went to work on her bust, kneading Rarity’s doughy tits between her palms. At some point—Redheart couldn’t exactly tell when—Rarity’s hand had slipped beneath her half-tied medical gown. The fashionista’s moans intensified, rubbing herself off as Redheart suckled even harder at her tit.

Redheart felt a pressure around her middle. Her belly was starting to round out; she’d been sucking at Rarity’s nipple for at least thirty seconds now, and she was already feeling like she’d eaten—or drank—a full-course meal. She grunted, and quickly switched to the other breast when the stream began to slow down to a trickle. More milk came, just as eagerly as had the first, eagerly rushing down to fill her gut with warmth and sweet creaminess.

Rarity’s groans were turning Redheart on even more. She began to rub her thighs together, hoping to stimulate her own needy crotch. Meanwhile, Rarity was groaning, even hiccuping from pleasure as her fingers and Redheart’s suckling lips drove her to the edge. She squealed, her body jerking as she hit her climax.

Finally satisfied, Redheart let her lips pop off of Rarity’s swollen tit—which was, she noted with some satisfaction, marginally less swollen than it had been before. Rarity was panting, a bit of sweat beading on her forehead. Redheart exhaled and wiped away a bit of moisture from her own cheeks before recalling the amount of moisture still dripping down her legs.

“Well,” she murmured, “that was certainly a good first dose.” She turned, somewhat awkwardly now that her belly was full of Rarity’s milk. It certainly felt much heavier, full of dense, creamy milk. It bounced out a bit in front of her, sloshing from side to side as she moved.

Redheart picked up her clipboard and scribbled something down on it. Then, she turned to Rarity and offered a small smile. “I’m going to prescribe regular visits with a specialist for your problem. It should take care of the situation.” She rubbed her distended tummy, then belched softly. A full blush instantly came over her face.

Rarity giggled. She, too, was a bright red. “I suppose I’m to report back to you, then?” she said, looking slightly abashed.

Redheart just chuckled. “Doctor’s orders,” she said, and winked.