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 from Delta. "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?"

"Iron.... we're siblings... I'm not sure it would be right..." Delta explained hesitantly. Iron simply lifted an eyebrow. "That doesn't answer my question, Delta. Do you like what you see?" She shook her flank a little at him. Delta bit his lip as he shifted his hooves in place, feeling extremely uncomfortable. He had secret occasional fantasies about his own sister, curious as to what it would be like, but never actually thought anything like that would ever happen. Unable to think straight, Delta blurted out, "Yes... yes I like it very much."

"Mmmm, I'm so glad that you do, brother... because I've wanted you for a long time... a very long time. I know how strange it is, but I just can't help but think of you all the time. I've known you all my life, and you're my best friend. For whatever reason, I just can't see myself loving anypony more than you... I... want you inside of me..." Iron began to feel wet as she muttered those last words, eager to feel her brother's love. He paused for a moment, letting everything he had just heard soak into his brain. After a brief moment, Delta walked slowly over to her, quivering in nervousness and anticipation. Mostly nervousness.

He lowered his head down to her flank and moved her tail to the side a little, blushing heavily before sticking out his tongue and giving her flank cheek a long, gentle lick. Shivers ran up Iron's spine as she felt his soft wet tongue on her coat. She lifted her head up and let out an uncontrollable moan, unable to contain the rush of pleasure flowing through her entire body. Delta licked again, giving his sister yet another surge of overwhelming emotions. She backed up her plot a little as she moaned again, signaling that she wanted more. Delta complied and slid his tongue between her cheeks, giving her moist and warm marehood a gentle lick. Iron gasped out in delight and began clenching the sheets of the bed with her hooves. Feeling much more comfortable with the situation, Delta closed his eyes and slid his tongue inside her, rubbing his tongue against the insides of her sensitive walls. His sister coo'ed in response, spreading her legs a little so that his tongue could go deeper. As his tongue went farther in, Delta began to feel incredibly warm; some of it was from the pleasure he felt from being inside of Iron, but it was also from feeling her warm heat against his face. It aroused him deeply, forcing him to thrust his tongue in even faster holding her flank with his front hooves and rubbing her cheeks gently. Iron clenched her eyes shut and let out a soft, high-pitch wail, crying out, "O-oh, I'm--I'm cumming, brother!!" Delta suddenly felt a warm juicy fluid rush into his mouth, coating it with a tangy, vanilla-like flavor. He swallowed it all, both of them breathing heavily in satisfaction.

"It's.... it's your turn now, brother~" She turned around and hugged him, bringing him to the bed and laying him down on his back, getting on her knees at the bedside and rubbing his thighs with her hooves. "I bet you'll taste delicious..." Iron smirks as she gazes at his thick member. She immediately took several inches of it into her mouth, gasping as she lifts her head up again. She giggled a little and goes back down again, wrapping her lips around his cock and bobbing her head up and down. Closing her eyes, she went even faster, moaning with each time she thrusts her neck down. She stroked his sides sensually and wrapped her hooves around his back, rubbing it slowly. "Ohhh, Iron..." Delta whispered as he holds her head gently, lightly thrusting into her mouth as she goes down on him repeatedly. Iron swirled her tongue around his shaft as they both thrust. Delta felt close, holding her head and pressing her mouth down on the base of his member. He felt waves of pleasure overcome him, firing his cum down his sister's throat. She took several large gulps before pulling her head back up again, smiling widely at him and licking her lips.

Iron crawled up on top of him, bringing her lips to his and kissing him passionately while looking into his green eyes. Within them, they could see the sincere love they had developed for each other. They were both on the bed now, with Iron on top of Delta, placing her hips on top of his own as they kissed deeply. They moaned into eachother's warm mouthes, wrestling their tongues together inside them. Delta's wings folded out on the bed as he adjusted his hips in alignment with Iron's, grazing her sensitive marehood with his hard member. On instinct, he held her flank and eased his way into her slit and immediately thrusted deeply into her, causing her to shriek in delight. Breathing heavily, they both wrapped their arms around eachother and held eachother close. Iron began thrusting her hips down on his member as he thrust up into her, the sheer pleasure causing them to tear up from happiness.

They could feel their hearts beating against each other, and time seemed to slow down. They could hear every little moan and sigh the other gave. Each of them knew that the other was getting closer to climax. "G..go ahead..." Iron whispered as she gave a gentle lick into Delta's ear, "You can come inside, it's okay." Delta was about to speak up at first, but opted against it; Iron knew what she was doing. In actuality, Iron had planned ahead for this and took spermicidal pills beforehand. Delta and Iron held eachother closely and stared into eachother's eyes, never wanting to let go. They kissed again, somehow even more passionately than before. And then, time felt like it was completely was frozen for the siblings. They both came simultaneously; Iron's sweet juices flowed down her brother's shaft while Delta pumped his thick hot sperm into his sister. Both collapsing immediately afterward, without pulling out they hugged eachother tightly and drifted to sleep in eachother's arms.

"I love you, brother."

"I love you too, sister."