"You just did little brother, you just did." she said.
"Are you upset?" he asked.
"No, oh God no, we were young." she smiled at him.
"Yes, but I suddenly felt it again, when we were messing about, I am sorry sis." he told her.
"You don't have to be sorry for feeling something." she assured him.
She held him, rubbing her arm up and down his, in a comforting way. Then they looked at each other again, and with nothing spoken, they moved towards each other, lips locked together, and tongues dancing around their mouths. Lynn moaned with pleasure, clearly enjoying her brother's tongue, and Dan ran his hands over her back, and then lower, running a hand over her bum. She, reached for his t-shirt, wanting to see that body she'd only glimpsed earlier, and she pulled it up.
They were both frantically undoing each other's clothing, and Dan opened her blouse, exposing her bra covered breasts. He reached for one, rubbing his thumb over the nipple area as he cupped her breast. Lynn was rubbing his now swollen bulge through his jeans, and she felt herself soaking between her legs. She sat up, undid her own button and zip, and slipped her jeans down, kicking them off to the floor. Dan followed her lead, and, as he was now wearing only briefs, he slipped Lynn's blouse off, leaving her in just her bra and panties.
"You're more beautiful than I ever imagined." he told her, sincerely.
"You were a skinny adolescent last I remember, now you're so fit." she replied.
They resumed kissing, and although they knew it was wrong, it felt so right. Neither of them were involved with anyone else, and neither had, or wanted children. They were just two adults, discovering they were attracted to each other. So, they shared a tiny bit more DNA than an average couple, but so what.
As they kissed, dan unclipped her bra, and it dropped onto the bed. He broke their kiss, moved down, and began licking and kissing her breasts. Her nipples stood out so beautifully, and he licked and sucked them, gently nibbling with his teeth, making Lynn gasp. She reached for his member once more, this time releasing it from his briefs, then pulling his foreskin back, revealing his glans. She bent forward, looking to reach it with her mouth, and Dan turned around so he could also reach her panties.
As they lay, and Lynn took him into her mouth, he slipped her soaking panties down, and he saw her beautiful, natural pussy, hair completely untrimmed. He began to probe the hair with his mouth, looking for her clit, and soon found her swollen bud. She smelled so good, and he slipped his fingers between her labia, then brought them to his mouth. She tasted wonderful, and he buried his tongue inside her.
Lynn was equally enthralled with his cock, sucking it, and trying to take as much of it in her mouth as she could, which wasn't much, as her baby brother was very well endowed. Dan fingered her while licking her clit, which was swollen so much, he could suck it like a fingertip. He lay on his back, and Lynn straddled him, without having let go of him with her mouth. Now he licked her, and slipped a finger in her bum, as well as her pussy, and as he slid them in and out of her, she squirted, and he caught most of it with his mouth, swallowing all he could.
Similarly, Lynn was bringing him closer to climax, and she felt him tense, his balls tighten, then he erupted, filling her mouth with his come. She felt fantastic, like she'd never felt with anyone before. She sucked and squeezed the last of his seed from him, then turned around and kissed him. They kissed, mixing their fluids before swallowing it all between them.
Dan was still almost fully hard, and as they kissed, Lynn relaxed her legs so she was just splayed underneath him, and she felt his cock nudge at her opening. She reached down, between her legs, and guided it inside.
"Jesus, who'd have thought that the biggest cock I'd ever take inside me would be my little brother's!" and she smiled at him.
They rocked together gently, enjoying the feeling, and the closeness they now shared. Dan looked down as he built a nice rhythm, and her breasts were rocking, but still so firm that they didn't sag at all. Her nipples were huge, and he bent his head to flick his tongue over them, making her gasp again, then sigh loudly as he thrust inside her again. Lynn wrapped her legs around him, and pulled him harder with each thrust, and feeling herself getting closer as she did.
Lynn shuddered in orgasm, gripping Dan tightly with her legs and her arms, and almost stopping his thrusts. She opened her eyes, looked up at him, smiling, and said,
"Fill me up baby brother, fill me full of that seed."
"Oh yes, I'm going to fill that lovely sweet pussy sis." he replied.
Then, as he increased his speed, he began to groan, shouting that he was about to come. He thrust hard into Lynn, spilling his seed deep inside, just as she'd asked. She felt it inside, loving every jet that he pumped into her. Then, he lay on top, looked in her eyes, and smiled. She looked more beautiful than ever to him, and he didn't have to pretend when he said he loved her. He always had, and he always would, she was his sister, and nothing could ever change that.
He went to withdraw, but Lynn pulled him back with her legs, and held him there.
"Just stay baby brother, just stay inside me for a while." she asked.
He rested his head on her shoulder, and remained, just as she'd asked.
He'd never felt so at peace, it felt perfect to him.