Author's note. I received a great deal of feedback from the original version of this story. I have corrected a couple of the bigger mistakes and changed the ending for the first chapter. The first bit of this chapter is actually the rewritten end of the first chapter. I will admit that when I reread it, I didn't like the final few paragraphs as much as I did when they happened. Please indulge me this vanity and allow me to rewrite history, at least this once. Thank you for your patience and understanding.
"I dare you to let me fuck you from behind." She responded by rolling over on her stomach, one leg on the couch, one knee on the floor.
"Go easy. Matt tried this once and I didn't like it. It's not very intimate. But a dare is a dare."
I positioned my engorged length at the warm moistness of her cunt. But before taking advantage of the situation, I decided to have some fun first. I began kissing and nibbling her ass cheeks and licking around her asshole, determined to both tease her and get her loosened up for the onslaught that was coming. She wriggled and squirmed, but she didn't try to get away. I lowered my head until just the tip of my tongue was darting to and fro across her slit. When I replaced my tongue with my cock again, Becky was much more receptive. This time I slipped the head in past her outer lips without resistance. When the thicker meat of my cock tried to enter behind, that's when the pain started for her.
"Slow down." I did. "Nice and easy now," she instructed. "That's it."
I pressed forward half an inch at a time until I had my entire length in her, reaching deeper than I had in the other positions. Then I pulled back until only the tip of my cock remained hidden and pressed forward again. Each stroke got me a little deeper. I made long, slow strokes and Becky began to moan. Hard, short strokes and she moaned harder. Fast strokes and she moaned faster. Hard, long, fast strokes and she began to buck wildly. I put rubbed my thumbs on her ass crack, spreading the cheeks. I gathered some of her wetness with my thumb tips and rubbed it on her brown rose. I could feel her sphincter muscles twitching from the excitement, faster and faster until the ring of muscles was fluttering. That was enough for me. We came together, me slamming her from behind for all I was worth until finally we both collapsed onto the sofa. She was face down, legs spread, me face down on her back, my semi-hard cock buried into her now sore pussy.
"Oh my God," she finally spoke. "It's my turn. Truth or dare?"
To be continued......................
"Truth." I was too exhausted for a dare.
"Why did we do what we just did?" I couldn't tell if this was real curiosity or post-coital guilt. It was kind of an awkward question for a sister to ask her brother, who was currently laying on top of her with his well spent cock buried in her now gooey quim. I don't know if I forgot the question or was too enthralled by the fulfillment of my lifelong fantasy, but I took a long time to come up with my answer.
"I did it because I love you and I have always loved you. I did it because you are beautiful and special. I did it because I have always wanted to do it and tonight the opportunity seemed right. We are both grown ups, long past the feigned abhorrence for this societal taboo. I find you attractive in so many ways and this was just my selfish way of demonstrating that to you." I used flattery, logic, and honesty, three traits that usually sold the contract to my clients. "Why do you think we did it?"
"I think," she replied slowly, "I think we did it because we can and because it felt so damned GOOD!" She was chuckling now. Her giggle were making her pussy throb, causing my dick to get hard again. She could feel this and panicked. "Please don't fuck me again right now. I am exhausted. If you make me climax like that again, I will just be ruined for other men."
She strained to raise us both up, but was enjoying the liquid velvet of her pussy as it surrounded my engorging member. I made her struggle for a bit before I reluctantly pulled out, my cock attached to her pussy with a long umbilical of my cum and her secretions. I lifted my self to a seated position on the couch and reached for my Tom Collins. A long sip and I felt refreshed. I set the cold glass down on my burning groin, refreshed by its chilly contents being rubbed along my semi-hard cock. Becky slowly got to her feet and went into the gigantic bathroom and I could hear the water running in the Jacuzzi. In a few minutes she called out.
"There's plenty of room in here for two, David." I knew I had to get up. If I sat on that comfortable couch much longer, I would sleep there. I creaked and groaned my way to the bath, my middle-aged knees aren't built for that much fucking any more. She was in the tub, warm water up to her chin, her hair pulled back into a bun. Her long neck was so inviting. I lowered myself into the center of the spa and put on hand on each side of her shoulders, leaning in close for a kiss. I kissed her cheeks, her eyes, her forehead, her lips and finally settled on her neck. I let my tongue dart in and out as I licked and nibbled her neck from her shoulders to her ear lobes. I love necks. She occasionally rubbed her nails on my thighs, scratching them lightly and raising the level of my excitement. As much as I loved nibbling her neck, my back was beginning to stiffen and get sore. I stood up straight, thinking I would sit down and pull her onto my lap so I could continue to lick her neck from a more comfortable position. Becky had other plans. When my cock cleared the water, she grabbed it by the base and pointed it straight at her own face. She pulled me toward her by the groin and she leaned forward and began to tongue my glans, occasionally darting her tongue into the tip, scooping out the precum that was gathering there. She put the whole cock back into her mouth and began to fuck my joint with her face. I didn't want to get fully aroused again, but my little head overruled my big head. Sore and raw didn't matter to it, erect and proud was the state it wanted to be in. My cock got its way.
For fifteen or twenty minutes I was the recipient of my deepest fantasy blow-job. Finally Becky had to give up or suffer lockjaw.
"I'm sorry, Sis. I can't possibly climax again. Three is two more than normal for me." I pulled away and got out of the tub. I was pruny from the balls down. I grabbed a gigantic towel and began to dry off. Becky got out as well. I grabbed another towel and wrapped her in it, taking the opportunity to give her a long hug, her face against my chest. She was sobbing.
"Why did he do it, David? Why?" I knew she was talking about her soon-to-be-ex-husband Matt. He had left her a couple of weeks ago for his secretary. That bastard had better not run into me at the wrong time.
"Because he's an asshole. He didn't know how well he had it. But he will, trust me."
"Don't hurt him. He's still the father of my girls. Scum he may be, but they still need him." She kept her face buried in my chest. I rubbed her back and neck, waiting before making a reply.
"I promise not to hurt him if you promise to NEVER and I mean NEVER take him back." I don't know why I said that. Probably because I knew my sister was gullible and trusting enough to listen to his cock and bull stories and weasel his way back under her roof, maybe back into her bed. The thought of Matt making love to my sister was infuriating. I realized that I was jealous and that I was having dangerous thoughts.
"You can't mean that," she replied, lift her head to look me in the eye.
"I can and I do. I know he's going to want to have contact with the girls and I can't stop that if they want to see him, but I don't want him near you any more and if Melissa and Andrea say that they don't want to have anything to do with him either, then I don't want him around period."
