Twilight groaned as she flopped over, her loins positively on fire. Her slit constantly leaked her warm juices all over the place, matting her fur and the sheets beneath her. She’d gone into estrus a few days ago, and no amount of sexual magic and her old toys worked anymore, for she had simply gotten tired of them. Fortunately for her, Cadence was fully aware of her special relationship with her brother, and while she was happy to let her husband spread his love around in their family, she preferred to let them conduct their lovemaking in private.
It wouldn’t be nice of me to wake him up in the middle of the night... Big stallions like him need their beauty rest, after all, Twilight thought, playing with the idea of waking him up. Although... a mare has needs. Shining snored away next to her, oblivious to her burning desires. Twilight flicked her tail underneath the sheets and lifted them up with a hoof. Her scent drifted up to her nostrils, only serving to further heighten her desire to be fucked silly once more. She squirmed on the bed, feeling her brother’s dried cum make her back stick to the sheets.
Shining had rutted her senseless just a few hours ago, but it did little to sate the burning sensations in her core, especially given the fact that he’d busted a nut over her back instead of inside her where it would have helped her most. Would taking a chance of becoming impregnated by my brother be worth getting out of heat? she pondered. Twilight rubbed her clitoris with a hoof, unable to simply lay there doing nothing. As her hoof grew slick with her pungent-smelling juices, she thought, Yes. Yes, It’s worth it... With a soft groan and a grin, she pushed herself up and draped herself over her brother, nuzzling him awake. She threw her right hind leg over his lower barrel, planting her crotch right over the opening to his sheath.
Shining stirred awake, blearily cracking his eyes open as his gaze focused on his little sister. He wrapped a hoof around her back, feeling her wings trembling against his leg. “Hey... you okay?” he murmured. Twilight bucked against his sheath, wiggling her hips to and fro as he heard her let loose a pitiful moan. “O-Oh. Again?” He glanced at the clock on the wall. “But it’s been only a few hours... You really need another rutting?” Twilight nodded against his chin then wrapped her forelegs around him.
“But I need you to stay inside this time,” Twilight whispered, feeling the fruits of her labors paying off as Shining’s slowly-hardening cock brushed against her flaming loins. “I need you to cum inside me and banish this blasted heat!” she hissed out.
Shining sat up a little bit. “But that means you’d get pregnant,” he said. “Are you sure you want to take the chance?”
Twilight sat up, keeping her hips locked firmly in place. “Look... I’m never going to find a stallion as handsome as you out there, and as a princess, I fear that any suitor would just want to take advantage of me and my position. I want to be a mother, Shining, and I can’t wait anymore.” A sly grin grew on her face. “I think Flurry would like a cousin, too.”
“Heh, I can’t deny that...” Shining rubbed Twilight’s hips with his front hooves as he gently bucked his own hips upwards, his shaft becoming slick with his sister’s juices. As his tip slipped past her folds, he shot her a comforting smile as his dick grew inside of her. “Last chance... are you a hundred percent sure about this? This isn’t just the estrus talking, is it?”
Twilight laid back down on his firm chest. “I’ve actually given it a lot of thought these last few months. I can’t think of anypony better to be the father of my foal,” she said, nuzzling his neck as a soft gasp escaped her lips. “Gosh, have you gotten thicker?”
“Nah, I think you’ve just gotten tighter.”
Twilight grimaced as his medial ring slid struggled against her entrance. “Y-You think? I read somewhere that mares can get tighter during their heat season, so... that’s probably it,” she said. Taking a few deep breaths, she forced herself to relax then pushed herself back, feeling her entrance stretch out around his thickening length. The tip of her brother’s cock throbbed inside of her as her pussy rippled along his length, almost like it was milking him for what it desired most. “Can you, uh... help a little bit?”
“What, my little sister needs help taking my thick cock?” Shining asked with a chuckle. “If you insist...”
Before Twilight knew what was happening, Shining rolled over and settled down on top of her, his weight pinning her to the sheets. She felt his cock twist around in her, his tip grazing against her G-spot. She clenched down on his length out of pure instinct, then pulled a pillow over to rest her head upon. “Coulda warned me first,” she muttered, shooting him a lust-filled grin as Shining stood up over her.
“Where’s the fun in that?” Shining shot back as he pulled her ass up until she was in the perfect doggy-style position. Moving her tail out of the way with a hoof, he pulled back until his tip was about to slip from his sister’s tight, velvety, and sopping wet folds, then pushed himself back in until his medial ring pressed firmly up against her labia.
“...Fair point.”
“Can you relax a little bit down here? You’re making it kinda tough for me...” Shining said, feeling Twilight’s pussy grip his cock like a vice.
Twilight rolled her eyes as she fluffed her wings. “Not my fault I have a well-endowed brother. Too bad you married Cadence, though... I would have loved to be your wife.”
“Yeah? Can you imagine what our parents would have said?”
Twilight cleared her throat and tried to imitate their father to the best of her ability. “Atta boy, Shining; always taking care of family first!” she said with a snicker that was cut in half by a particularly wet-sounding squelch as Shining’s medial ring finally pushed past her labia. “Gods above...” she whispered as her vision turned blurry for a couple of seconds.
“All good, sis?” Shining asked, gently bucking his hips back and forth as he worked the last bit of his cock inside of Twilight.
“Y-Yeah, just gimme a minute.” She let out a content sigh, feeling incredibly full.
“What do you think Mom and Dad are gonna say when they see you carrying my foal?”
“They’re not going to know until after our foal is born, Shining,” Twilight said. Her ears flicked back as she thought of her brother’s wife. “What would Cadence think?”
“She already told me that it was fine to impregnate you,” Shining said with a short chuckle. “But only if it was you; she gets off to the thought of me pumping you full of cum.”
Twilight’s ears perked back up as she blushed. “The Princess of Love masturbates to the thought of her husband impregnating his little sister?” she said with mirth. “Should have seen that coming...”
“Yeah, you should have, but you were too focused on getting my cock inside of you. What number is this now?”
“Seven, I think. I lost track after the first couple of days.” Twilight’s mouth formed a small ‘O’ as Shining’s cock slid deeper inside of her, inch by inch. “Why does your dick have to get thicker near the base?” she asked, feeling his fuzzy balls press up against her crotch. Her pussy tensed and relaxed across his length over and over, sending small tingles down her hind legs.
“Would you prefer it to be thinner?” he asked, laying down across her back. He wrapped his forelegs around her and bit down on her left ear, nibbling on it just how she liked. “You ready?” he whispered into her ear, knowing that his breath would tease the sensitive hairs in it. He grinned as her ear flopped against his muzzle. Twilight nodded a few moments later. “Don’t blame me if I cum pretty fast; your pussy is better than Cadence’s, but don’t tell her I told you that,” he said, settling down into a gentle rhythmic fucking that quickly turned into a rutting of wild abandon. “Before I left, she did mention that she wants to have a threesome with you and me. Maybe you can come up sometime next week? I’m sure she’d love that.”
Twilight lit her horn and focused her magic on her clitoris, using the same vibration spell that she’d been using ever since she’d gone into heat. “Sure, but only if you stop teasing me,” Twilight said.
“If you insist!”
Twilight groaned loud and proud as Shining’s balls slapped against her clitoris, making her tongue slip out of her mouth as she panted heavily. She felt a familiar tightness wind up in her core, though she didn’t want to cum, not so soon. She bit down on her tongue as she forced herself to hold back, for she wanted to cum just moments before her brother.
“Guh, why’d you get so tight all of a sudden?” Shining panted as his tip flared up inside of her. “You’re gonna make me cum any second now...”
Twilight’s eyes slid shut as she finally relaxed, letting herself become lost in the pleasure. The tightness in her core grew until it finally released, an overwhelming orgasm rushing through her body. Twilight heard him grunt a couple of times, then an amazing warmth surged deep within her. Yes! she thought, feeling his hot seed overcome the heat in her core. Shining flopped down on his side without warning, pulling her with him as he kept pumping her belly full of his cum. He pulled her close, keeping his cock as far inside of her as he could. She nuzzled his chin as she finally felt his cock start to soften, her cheeks burning a bright rose.
Shining panted heavily behind her. “You think that did it?” he asked, pulling his cock out of his little sister’s pussy.
Feeling Shining’s cum slip out of her tingling slit, Twilight lit her horn and massaged her brother’s cock until it stood at full mast once again. “Perhaps, but I think it would be best to go again. I really hate being in heat!”
