>Shining Armor searched the room again.
>He felt that insatiable itch again; the need for something to satisfy his desires.
>Unfortunately his sister seemed to have nothing even slightly resembling a phallus; every soft, cushiony, and...
>He paused. Something had caught him.
>Twilight’s smarty pants doll.
>He picked up the little grey plush toy, buttons sewn on as eyes.
>Surely he couldn’t...
>Nopony was looking. 
>He could probably return it after he was done. It would require a little pushing, but maybe..
>The urge was too strong.
>Unable to wait any longer, Shining held the head of the toy against his member, breathing deeply and then pushing.
>The entrance to his cock yawned open to accept the foreign object, a sharp stinging pain that tickled all the way down to his balls and up his spine.
>His cock stiffened, filled with that same ticklishly agonizing sensation. 
>The head had been swallowed, and with a little more effort he body disappeared inside too; his member was now bulging; taut around the head and upper body of the doll; so tight he could almost make out the shape of the two button eyes.
>His eyes swiped over to the door every few seconds just to check he was still alone. It wasn’t a pastime that was particularly easy to explain away.
>After not much time almost the entire doll resided within his cock; he poked it with a hoof and watched it twitch and leak a few drops of precum, veiny and bursting.
>With a few painful flexes he watched his cock slowly swallow the toy deeper and deeper inside, only the leg hanging out the very end.
>Hoof trembling, he reached to give it a tug.
>With a rending, raw pain it was yanked out from his urethra, now drenched in precum.
>Shining eased it back inside, the fabric scraping along the sensitive lining of his urethral tract.
>Out, and then in again; gaining speed as his confidence grew.
>His cock was numb and his mind swirling with immense pleasure.
>Climax was approaching, but it was interrupted.
>”Hey! What are you doing with Smarty Pants!?”
>It was his younger sister; the filly was in the doorway.
.>”T-Twily!”
>His hips jolted back and with them his cock sucked the doll all the way inside and right to the base of his member.
>”I told you to stay out of my room, and what are you doing with him!?”
>The filly approached the drooling end of her brother’s cock and shouted into it.
>”Don’t worry, Smarty Pants! I’m coming for you!”
>”Twily! What’re y-“
>Before he could stop her the filly had already used her hooves to spread Shining’s urethral opening as far as it would go, and then some, not even hesitating before forcing her head inside.
>”Twily! You can’t-“
>She was a stubborn filly, though, and she wasn’t going to listen.
>Stretching his cock further than he thought possible, she continued to clamber inside, her hooves digging around into the walls of the tube surrounding her, scratching and irritating.
>The movements were too much. With a shuddering gasp the young stallion felt himself ejaculate, the cum hitting Twilight directly in the face.
>”Hey!”
>She wasn’t stopping, though, reaching deep into her brother to grasp at her doll and only succeeding in pulling herself further inside.
>A writhing, wriggling, mass that weighed his stallionhood down, only her tail now swinging from the tip of his cock.
>”Almost... got him...!”
>There was a gasp and a loud crash.
>Shining turned quickly to see his mother in the entrance to his room, the tray of milk and cookies in a smashed mess below her.
>”Mom! Um... I can explain?”