Irresistible, Undeniable

Iron Heart could hardly wait for her brother Delta Flame to get home; she had a special surprise for him. She felt she had waited far too long for this as she got everything ready. She nearly shook with excitement as she lit the candles in the room and checked the whole house to make sure there were no distractions. Suddenly, she heard the front door open.

"I'm back, sis.... hello?"

She came out from behind the bedroom door with a large smirk on her face, obviously hiding something. "Hi, brother..." She said, looking unusually excited. "Uhh... hehe, what's up, Iron, what're you up to?" he replied, asking jokingly. "Come here, I have something to show you..." she responded, backing into the bedroom with a giddy-sort of attitude.

He decided to follow her, but was a little taken back by what he saw by the time he got in; his sister was already leaning on the bed and looking back at him in the dimly-lit bedroom, with smooth jazz playing quietly on the stereo. "Uh...uh...uh..." Delta stammered, unable to really comprehend what he was seeing. She giggled as she looked back at him, "You like what you see?"

Delta could only look at her in shock.

"Iron, what on earth are you doing?! Iron... this isn't right, I'm sorry, but I don't think that would be a good idea, we ARE siblings, after all... I forgive you, but I want to pretend this didn't just happen.."
However, before he knew it, his sister was already face to face in front of him with her arm around his neck; with a disturbingly calm expression, she replied, "I don't think you quite understand... I'm not going to take 'No' for an answer. You're going to LOVE me." She then brought him to the bed with his head in her arm as he struggled to break free, trying hard not to imagine his imminent fate.

"No... let me GO, Iron!"

Confused and upset as to why his beloved sister would do such a thing to him, he broke down and started to shed tears of despair. Iron shoved him onto his back on the bed, immediately jumping up on top of him and pinning him down so he couldn't escape. "Stop being such a foal and quit squirming. You should be loving this, all colts love sex, don't they?" She leaned down and bit his neck hard to maintain her dominance over him. Delta then let out a yelp of pain, now sobbing as he yelled back in pain, "Not with their own sisters!"

"SHUT UP." She snapped at him, taking her secret stash of leather ropes under the bed and tying his hooves to the bed posts so he couldn't escape. Once he was tied down, she decided the only way to shut him up was to ball-gag him, so she got her ball-gag and tied it around his head, shoving it into his mouth. She then went to her closet and brought out a suspicious object, grinning at Delta as she walked to the foot of the bed. She then held it up against the dim light for her brother to see. He looked on horror as his eyes adjusted, and he could finally make out what was a large vibrator in her hand. Before he could react, he felt a sharp pain in his plot as Iron shoved the massive vibrator, turned on 'High', deep into him. He felt shockwaves of pain course through his body, especially around his pelvis. Delta grunted and let out loud gasps of agony as the faux shaft forced its way into his inner walls. Tears began to flow down his cheeks; he unintentionally tightened the grip on his fetlocks even more as he shook in place, trying desperately to escape from the nightmare. To avoid any more pain than neccesary, he then decided to not struggle anymore, though he would certainly hate it just as much. She smiled with a cruel expression of victory as she straddled him and lowered her hips down onto his dick. "Your mouth was saying 'no', Delta, but your body is saying 'yes'..." Iron points out, noticing that his dick is stiffening.

'Dammit... its not like I can control it...' Delta thought to himself as he closed his eyes; Iron bit his neck again and shouted, "Oh no you don't, open your eyes and look at me! I don't want you imagining anypony else, you're gonna buck me and only me, understand?!" She pressed her hoof down on his neck in anger, forcing him to open his eyes again; she took the gag out of his mouth temporarily. "That's better... now say you love me... say it!"

"I... I love you... Iron..."

"I didn't understand you. LOUDER!"

"I love you, Iron!"

"Call me sister!"

"I love you, sister!"

Iron was finally enjoying herself and her dominance over Delta, moving her hips up and down on his cock and putting the gag back into his mouth, getting faster over time and holding his neck to keep him in line. However, Delta was unable to enjoy himself at all, heartbroken that his sister, who he had trusted so much, who he shared precious memories with, was now mercilessly raping him, and there was no escape. He had done nothing to deserve it, yet here he was, forced to go through the humiliation and pain, and forced to pretend to like it. He lost his train of thought when he found Iron Heart kissing him and biting down hard on his tongue with her teeth and humping him faster, bringing him close to an undesired climax. Iron Heart noticed this too, which caused her to only buck him harder, eager to get him to cum inside her, as well as cumming herself. Tears ran down Delta's cheeks as he blushed uncontrollably and gasped, finally firing his cum into his sister, who also came in response . As she got off of him and untied him, their combined juices dripped down Delta's sides and onto the bed; she then slowly took the ball-gag out of his mouth and quickly pulled the vibrator out of his ass, causing another sharp pain to run up his spine, and asked him in a serious tone, "This never happened, got it?" She held her hoof down on his neck a little so he got the message.

"This... never happened...."

"It better not have.... love you, brother!" She suddenly said with a completely normal, happy expression, smiling back at him as she walked out, leaving him in the dimly lit room, which reeked of sex and anxiety. Delta didn't move an inch from the bed for the rest of the next few days, unable to think straight, and simply in shock from what had happened. "It never happened," he kept telling himself. "It never happened."

THE END