Your thoughts begin to haze over, and as you bury your face between Boundless' mounds you rub your side against her upturned belly. In response, there's a flurry of internal movement that sets the surface shifting and her hooves curling. The twins are awake, and it feels like they're annoyed that you might get milk priveleges over them. Tough luck - making mommy feel good is the priority right now. And besides, she's got plenty to spare. You wrap your lips around the bloated nub of her teat, teasing the tip with your tongue. The taste is sweet, almost cloying, but Boundless voices her approval without words, so you commit fully and latch on, following up with a firm rhythm of squeezing and pulling. Boundless' body quivers all around your head as youb egin to suckle, and rewards your efforts without delay.
 
You swallow deeply and lick your lips, but pause as you feel a wingtip nudging insistently against your hindquarters. You raise your head, confused, to see Boundless craning her long neck to look at you over her belly as she lets her wings hang limp. She's sweating profusely, panting, fixing you with half-lidded eyes. "P-please, hon," she stutters,  "Move on. No more playing." She shivers gently, all the way down to the base of her spine where her tail twitches and flags. The message is clear enough, so you nod, rising to your hooves and making your way around her hindlegs with almost mechanical purpose.
 
Without her tail or clothes in the way, you're suddenly confronted with your first clear view of Boundless' backside. In contrast to the slender frames of her sisters, her hips are fleshy and broad, resting together in a plump heart shape. Who knows how much of the mass on display is natural for her, and how much was packed on as a result of her pregnancy? You draw close, nuzzling her, marvelling not only at the soft cushioning that coats her butt but also the strong muscles that must exist underneath, to have carried so much weight with such grace. Then, with as much tenderness as your hormone-addled brain can manage, you lay your hooves on her and slowly spread her cheeks.
 
The hot stench of feminine musk hits you like a brick, and even Boundless reacts to the air touching her most sensitive places with weak little kicks of her hooves and an instinctive widening of her legs, biting her lip to hold back what sounds suspiciously like a squeal. Her nethers are more than proportionate to her large frame, visibly aching and swollen, slick and wet and *trembling*. Just how long has it been since she last had the means or opportunity to get some relief? With a deep breath that's as intoxicating as it is invigorating you take the plunge, stroking her outer lips with the very edge of your hoof. The response is immediate, just as if you'd shocked her, and this time she really does squeal, loud and low and drawn out through clenched teeth, a tone of delight. Her puffy lips part on their own. revealing luscious pink-red flesh, and you lean in close as if mesmerised. You cast aside questions of how you might mount her - your own needs can wait - this poor mare needs a thorough service right this second.
 
And so, with no more delay, you put your mouth to work. There's plenty to keep it busy. Licking and kissing come first, exploring the delicate flesh to discover her most sensitive places; to spread and savor the fluids of her lust, dizzying in their potency. Next is gentle nibbling, playful little flicks of the tongue; taking whatever loose skin you find between your lips to teasingly suck and pull. Weighed down by her foals and drained of strength by the sensations rocketing through her body, Boundless can only squirm and moan helplessly, overcome with ecstacy. You wonder if her sisters know what's happening - surely Auriga isn't far away.
 
Never mind that now. At last you decide to plumb the depths. You can practically *see* the heat rising from her core, and as you bump the tip of your muzzle against her opening it's like pressing your face into a paradoxically soft, wet furnace. One that twitches and contracts powerfully all around as you seek out her button. You find it soon enough - it's bigger than you've ever seen on a mare - and immediately give it the exact same treatment you gave her teat. Gentle licks, soft nuzzling, and then a firm, thirsty suck that you drag out for as long as her shaking and your body's impatience will allow.
 
Her climax is loud. Loud and messy. You'll stink of *her* for days, whether or not you find a shower in the meantime.
 
Once the immediate storm has passed and her body's begun to calm down, you set to faithfully cleaning her up, and then and make your way to her side once again to let her back down gently with some more belly rubs. Boundless watches breathlessly, barely lifting her head as you gently lay your hooves on her tummy. You ask her how she's feeling, and she manages a low noise that sounds vagely like 'good'. You decide to take things slowly for a while to let her pull herself together; you've got all night, after all. A minute or so later she raises her wing again, stroking your back fondly as you gently massage her in turn. You ask again, relaxing a little and hugging that gorgeous green swell.
 
"Thank you, hon," she murmurs with a giddy smile, "that helped. So much..."
 
The pair of you settle in for a gentle session of snuggles and belly rubs, with the expectation that libidos will flare up again soon enough, but the twins seem to have other ideas. As time passes they get active - very active, to the point where it's starting to cause Boundless some genuine discomfort. Again her neck and sides become beaded with sweat, her belly shifting as the foals kick up a storm. Every few minutes she cuts herself off mid-sentence with a little wince, or suddenly shifts in discomfort. No amount of affection from either of you seems to be able to calm them down.
 
"Th-they're changing position, hon. I think-" Boundless cuts herself off with a sharp hiss and she grabs your hoof. There's tears in her eyes; of pain, but also desperate hope. "Get my sisters. The foals are coming."