Curiosity

Shining Armor just got home from a long day. He had been away training to be part of the royal guard and had returned for a short vacation. Having been tired and tense he trotted into the room he still shared with his little sister. His parents had just gone out for the night and she was already asleep. He hopped on to his bed pulling out a magazine of mares revealing themselves in scandalous ways. Using one hoof he gently started to stroke himself. His shaft grew until it was fully erect. Using his magic he opened a box hidden under his bed and took out a bottle. He squeezed out a clear gel and started stroking faster as he spread it over his cock.

Twilight shifted in her bed quietly. Blinking a few times from under her sheets. It was dark but she could tell it was her brother on the bed across from her. She was about to greet him when she saw his hoof moving. She had never seen him like this before he left. His breathing was hard, his horn was glowing bright and he was grunting as he stroked faster. All of a sudden the stroking stopped as he convulsed and a white substance came out.

Shining panted and cleaned the mess up. It was still too early for them to come home and he wasn't satisfied yet. He turned a few pages till he found a mare he liked and began the process again. Unaware of his sister watching he got more lube and started moaning louder as he stroked himself.

Still watching and confused Twilight stayed quiet as she felt a strange heat growing between her thighs. Subconsciously she started rubbing her legs together as she watched. The feelings increased and soon she was lightly panting along with him. This time when he came she had her own silent orgasm. The feeling was overwhelming and tired her out, so when he checked to make sure he hadn't woken her up she was passed out.

For the rest of his time home, every night that he would stroke himself Twilight couldn't help but watch and do the same. Eventually she got to doing it on her own. The last night he was there he went out with some friends and had a few drinks. When he got home he was still a bit buzzed from all the shots he took. He trotted quietly past his parents room to the bathroom, hoping a hot shower might do him some good.
After he got out he heard light whimpers coming from the room he shared with his sister. "Twily?" He peaked through the door to see her rubbing herself. Slowly he started to get an erection. He kept watching until he heard her moan.

Twilight whimpered as she drew close to her orgasm. "Big Brother." She moaned his name, unaware of his presence. She called his name out a final time as she reached her orgasm. Panting she started to relax until she heard the door open. "Shining!" She squeaked and tried to cover herself fast, embarrassed at her actions.

"Its okay Twily. Its just me." He looked down at her body. She was small and still had just begun to blossom, but he couldn't help staring at the juices flowing out of her. "Look, you made a mess. Here," he pulled her to the edge of the bed and brought is mouth between her legs.

Scared she protested at first. After feeling his hot breath on her lower region she settled down. "Brother?" Twilight questioned as he started to lap up her juices. "Brother... What are you...d-doing?"

Shining looked up at her as she moaned. "Want to feel really good Twily?" He stopped licking to look her in the eyes. She nodded nervously as he pushed her lightly on her back. He carefully positioned himself over her and placed his shaft at her entrance. Slowly he started rubbing his shift against her wet folds. "Oh Twily, you're so wet already." He panted as he continued to grind against her. "Want more?" He looked down, the lust over coming him.

Twilight stared up at her brother. She could barely speak through her moans. "Y-yes. P-please!" Her body wanted more, but she didn't know what exactly it needed. All of a sudden the grinding stopped making her pout. "Big Brother why-"

Leaning down he kissed her gently. He placed his cock at her entrance hesitantly prodding her. He kept this action up until she started bucking her hips instinctively. Only the head of his cock had entered her so it wasn't too late yet. "Twilight I-" He stifled a moan as she bucked her hips some more. The pressure was almost too much for him. He pulled back and started sliding his shaft through her folds once more. "Twilight, want to make your brother happy?"

Looking up at him she nodded through her panting. He had her open her mouth and start sucking his tip as he grinded his base against her. She opened wide and welcomed the intrusion. It was hard and soft at the same time. She began sucking and licking. Her moans were muffled by his thrusting into her mouth.

Once she orgasmed one final time Shining started to thrust more. At his peak he pulled out of her mouth and began stroking himself faster. "Twilight, want to taste your brother's cum?" He knew she would agree even though she didn't know what he meant. He moaned as he pumped faster. "Open wide." He instructed then blew a load all over her. Shining watched as she swallowed what got in her mouth.

He knew it was wrong. She was his little sister and yet... Her body was all he could think about on his way back to Canterlot. "No... It can't happen ever again. Not with her."