Rarity gulped as she walked into her sister's room, horn lit as the light of the hallway lit her sister's sleeping form. She'd grown into such a beautiful young mare. She could feel it as her magic enveloped her. Every inch of her curves. The soft give of her skin.
She took a breath as she walked in. Rarity was completely nude and the formerly free swinging cock was quickly showing it's eagerness as she strode into the room.
A quick motion of her horn and the covers flew off of Sweetie. The spell she'd cast would ensure she wouldn't feel anything. That she wouldn't wake from it.
Rarity shivered again as she looked her over. Her shirt had been pushed up from moving in her sleep, exposing her soft belly. She reached down and exhaled a shuddering sigh as she felt her sister's soft skin.
Her hand traveled upwards until her fingertips were stopped by her sister's breasts. Unlike her own Sweetie's chest hadn't quite grown to such extents. But they were still adorable and so soft.
Rarity pulled her hand back before she began unbuttoning her top, biting her lip as her sister's torso was soon exposed. With her spells she could do anything right now. But even the simple touch of her belly had filled Rarity with guilt.
She felt herself throb as she stepped forward, cock twitching madly above her little sister's body as pre dripped down, landing on her nipple. Oh how she'd love to smear it about, to massage it into Sweetie's skin. Make Sweetie belong to her in such a way. But she couldn't. What she was already doing was beyond what she'd usually accept fantasizing about when it came to her.
She enjoyed violence. Gore. The horrible things she'd done and wanted to do to others could fill multiple books. She'd made more than a couple creatures go missing. There was even one time she'd found a female Timberwolf and fucked it as she slowly burned it to ashes.
But Sweetie? She wanted none of that. She wanted to hold her. To kiss her, caress her. She wanted to make love to her. She was deeply, deeply in love with her little sister and wanted her in a way that no amount of violence could fill.
She looked down and gulped at the sight of her sister's legs. She couldn't bring herself to use her hands so she magically pulled her pants down. She shivered at the sight. Her sisters cock was pretty average in size but when Rarity saw it, nothing could compare to her. Unlike her own oversized purple bitch breaker that hung partway out of her sheath at all times. Sweetie's was a cute pink that hid inside her sheath completely like it was supposed to. She moved down and looked between her legs. Her cock throbbed harder still as she saw a hint of her sister's tight pink slit.
Oh how she'd dreamed of it's taste. Of how it'd feel around her cock. Of course she knew that Sweetie couldn't take her full size. Very few could. But she wouldn't force it in her like she would them.
She sighed and stood over her sister, hand around her shaft as she began to stroke. "Sweetie. How I desire you. I've dreamed of you so many times. A secret ceremony with only the two of us exchanging rings. I know it's wrong. I know I'm wrong. Wanting my sister as my bride? Pah! ... I know but I can't help myself. You're so beautiful. So understanding with my desires for others. I know you don't like them but you never try to change me. You couldn't know how much that means to me."
Even as she was speaking of love and marriage, that didn't change the fact that she was slowly stroking herself above her body, drop upon drop of pre landing on her little sister's sleeping body.
"I- I want to feel your lips on mine. Your body in my arms. I want to do everything with you. I want to make love to you." She moaned aloud, not bothering to hold back since she knew Sweetie wouldn't wake "Not the violence I enjoy. Love. Soft caresses, sweet nothings. I want to hold you, to feel every inch of your body." She admitted before moaning as her first orgasm of the night began.
She pushed her cock down and moaned as she watched rope after rope splash onto Sweetie's chest. Rarity moved her cock to the side and shivered as her cum landed on Sweetie's face. Landing in her mouth and mixing into her hair.
"I want to feel inside you. I want to feel you inside me. I want to feel your mouth, I want to feel you in my mouth." She groaned as she kept stroking her now extra sensitive length. "I do apologize for how much of a broken record I must sound like but it's true. I want to do so much with you."
She moaned again and glanced down again, gasping as she noticed Sweetie slowly but surely growing out of her sheath. She was getting aroused in her sleep! "I can only hope that I'm the reason you're getting so excited." She said with a small giggle "Of course I know it could just be blood collecting in one place but a mare can dream that the mare she loves would get hard dreaming about her." She looked at it more intently "Oh, Sweetie. It's such a cute shade of pink. So smooth. Completely different from my own purple, vein covered thing." She licked her lips "How I'd adore feeling that wonderfully smooth shaft push between my lips as my tongue worships it with everything that it can. You deserve that much at least."
She could feel herself building up to another orgasm. Nothing turned her on more than sweetie. There were no holes in the world that looked more inviting, nor a cock that looked more delicious than those attached to her sister.
"Mmm~ Blast it Sweetie. I want it. I want you. But I'm far too much of a coward to say it. I want to wake up in the morning kissing you. Even if morning breath is bad, I don't care. I want you to be the first thing I see and do each morning. She moaned again, hand moving like mad across her cock, sweat collecting on her body. "I want you so badly. My dear, beautiful little sister. I want you as my lover, as my partner and as my wife." She said before moaning even louder as she came once more. One rope landed on Sweetie's face, another on her belly but the rest she'd aimed right at her sister's half hard cock.
She watched as her sister's legs unconsciously pulled together. The wonderful timing allowed the cum to simply collect around her cock as more and more was added.
Rarity panted softly as she looked her sister's body over. Her pale coat covered with Rarity's warm seed. Though Rarity knew that her spell would ensure that none of it could be felt. The sight alone was burned into her mind. She wanted more but she couldn't bring herself to. She'd done horrible acts to so many but couldn't do more than touch her sister's stomach.
She sighed and lit her horn, watching as the magic collected the cum into a floating orb above them and sighed as she looked her sister's body over again as she used her magic to carefully redress her. She frowned a little as she pulled her pants over her cute cock but knew it was for the best.
She looked at the orb of cum and bit her lip. She shouldn't and she knew it but... she pulled out a drop and removed her spell preventing Sweetie from feeling. It was barely anything compared to how much she'd glazed her sister with and lead it towards her sister's mouth. She gently ensured it went it and shivered as Sweetie's body reacted, swirling her tongue and swallowing. Such a lewd, unconscious reaction. She had to get out of here before she lost control of herself.
She leaned forward and kissed her sister's forehead as she had so many times in the past. "Good night Sweetie." She said quietly before she made her way to the door.
Her still hard cock bobbed with each step as she stepped out the door and released the spell keeping her sister asleep as the door closed behind her.
Author's Note
This was just a little quick thing I wrote for a friend. So might be kinda bleh.