She wasn’t making any move to jump up and leave, but I could tell she was on the verge of deciding what to do.
“It does feel good though, doesn’t it?” I said, quietly and moved my hips so that my cock slid up and down her slit a little.
“Oh Chris, we mustn’t,” she said, unconvincingly, understanding where this was about to go, “it’ll change everything,” she added.
“I am only using my cock like I did my fingers and tongue,” I said, matter-of-factly, putting more pressure on my cock against her.
She put one hand down to feel where my cock was and pressed my cock harder against her, “Yes, I know, but it’s not really the same is it?” she said, and at the same time groaned, sensuously, at the feeling the contact of my hard cock was giving her.
She was continuing to hold it hard against her, her labia almost wrapped round the length of my cock, the head grazing against her clit.
She was moving her hips again now, making my cock slip further up and down, pressed in-between her wet lips. I looked down and could see that the way she was pressing it at the bottom of the stroke, was forcing the head to almost penetrate her, but not quite. No wonder she was reluctant to stop even through her qualms.
“Press it in a bit harder,” I whispered, wondering if she really would.
I could feel her hand trembling against my cock, wanting to, but not wanting to, as the conflict went round in her brain.
“I don’t think we…”
“It’ll just be a little bit,” I pressured her, “I know you’d like to feel it wouldn’t you?”
“Chris, we can’t…”
“Only we will know, go on press it harder.”
It would have been easy to just slide it inside her, but I wanted her to be the one that initiated that ultimate step, but would she?
“I know we’ve already gone too far, but if we…you know…” she whispered, still holding my cock to her.
“You can feel me rubbing against you, it feels good, doesn’t it?” I said.
“Yes, but any more and…”
“And it will feel even better, won’t it?” I coaxed her, “we could just see how it feels for a moment, if you press a bit harder.”
She was biting her lower lip again, but I felt an increase in pressure from her fingers. Not wanting to let the opportunity slip by in case she changed her mind at the last moment, I altered the angle of my hips very slightly seeing and feeling part of the head enter her, so that my cock was no longer lying between her pussy lips, but was pointing between them, pushing them apart.
“Oh God Chris, I can feel you there,” she exclaimed, “you’re almost in me, are you sure we should?”
“It feels wonderful Julie,” I said, rocking my hips so that the head moved in and out between her lips just a small amount.
“But we are almost actually fucking,” she said, as if it was a revelation that had only just occurred to her.
We are, I thought to myself, and it is the most amazing feeling that I never thought I would be sharing with my sister. Those erotic thoughts somehow incited me to press forward a little more forcefully, and the entire head of my cock disappeared inside her.
“Chris, Chris, I can feel you inside me more now, stop, I don’t think we should,” she said, a bit panicky, pressing her hand against my chest.
I stopped, the head of my cock still inside her, “You know, despite all our fights and arguments, that I love you, don’t you?” I said.
She seemed taken aback with this change of conversation and didn’t answer.
“You are worried that this might change things, but I think it will just make me love you more,” I said, uncharacteristically serious.
“You…you mean that?” she said, her face taking on a softer, more vulnerable look.
“Yes, of course.”
“I didn’t realise,” she said quietly, “I thought you just liked annoying and pranking me.”
“Well, that as well,” I said, grinning, thinking that this was a strange conversation to be having with my sister while my cock was partially inside her.
“And you really don’t think doing this might spoil all that?” she asked, looking for confirmation.
“No, I don’t, as long as it’s our secret and that means no one else can ever know. What about you, what do you think?”
“I am not sure, I never expected to be doing this, but I admit I like the feel of you and our closeness now.”
“Yes, me too,” I said, looking at her shining eyes and soft features.
“It…it would be this once only, the only time though, I think,” she said.
I felt her resolve weakening, and the hand had disappeared from pressing on my chest.
“If that’s what you want,” I answered.
“I think it would have to be; it would be too risky.”
“You may be right,” I agreed, but wondered if she meant it.
“Come and kiss me,” she said, suddenly, putting her hands onto my arms and pulling to get me to lie down on top of her.
“What about…” I looked down at where we were partially joined, knowing that if I moved down, my cock would almost certainly slide into her.
“Let it,” she said, sexily, more or less reading my mind.
“Really? You are sure?”
She nodded and pulled me harder down to her.
That movement of my body down towards her did as I expected, and I felt my cock sliding slowly and deliciously deeper, into her tight, waiting, hot tunnel.
As I reached the point where my lips met hers, she gasped, “Ohhh, fuck, Chris, mmmm, that does feel good.”
At that moment I felt our pubic hair touch, my cock buried fully in my sister’s warm pussy.
I kissed her lovingly, and she opened her lips almost immediately to press her tongue into my mouth. Over the next few minutes, lying still, but inside her, I discovered she was an amazing kisser. She certainly led the way; her tongue touching every part of my mouth, sucking on my own tongue, almost like I imagined she would suck a penis.
The tongue acrobatics, combined with the feeling of my bare chest pressed against her hard nipples, and my cock snugly inside her, was having such an effect on me that I felt my cock twitching, followed by a reciprocal squeeze of my cock from her vaginal muscles deep inside.
It was so sensual just lying there, siblings, joined as one, but my body was trembling with the urge to move and to actually fuck this sexy woman, and I was unable to resist.
Starting slowly, I pulled almost all the way out and then as slowly as the first time, pushed my cock back inside her until I couldn’t get any further in. It only took that one thrust for her to join in, matching my repeated thrusts with an uplift of her hips.
We kissed as we began to gather momentum, my one hand squeezing and teasing her breast and nipple, hearing her groan through our kissing and loud nasal breathing. As we reached maximum penetration, I could feel my pubic bone mashing against her clit and each time another groan. I was obviously doing the right thing for her.
“If anyone finds out…” she started, breathlessly.
“They won’t from me,” I said, cutting her off.
“Oh God, Chris, never in my wildest dreams did I think we’d be doing this” she mumbled, her lips finding mine again.
We were really in synchronism now; as I was thrusting into her, she lifted her hips up to meet me, getting the maximum penetration possible. At times I felt the head of my cock bottom out, such was the depth she wanted me to be in her.
I moved my hand back up to stroke and squeeze her breasts and nipples, her moans and sighs gaining in volume as we made this new secret between us.
“A bit faster Chris,” she urged me.
I did as she asked. My cock ploughed in and out of her, causing whatever made her juices go into overdrive, the squelching noises from down there getting louder.
“Yes, yes, Chris, nearly there, oh God,” she shouted, louder than I would have liked, for if she continued at that volume, we wouldn’t have to tell the neighbours, they would hear for themselves.
The sight and sound of my sister climbing up towards her climax, and the knowledge that it was me taking her there, was having a profound affect on me too. I could feel that it wouldn’t be long before I would reach the point of no return.
“Oh, fuck Chris, I am so close, harder, harder,” she said, opening her legs as far as she could and pushing herself against me with all the strength in her athletic legs.
“Julie, fuck, I am about to come, I have to pull out,” I said, panicking.
“No, no, come inside me,” she gasped, putting her arms around me to stop me.
“What if…” I stuttered.
“It’s ok, just don’t stop,” she managed.
It was too late anyway.
I felt the eruption start at the base of my cock and in less than a second the first jet of my cum sprayed into my sister’s vagina.
She felt it.
“Oh yes, come in me, that’s it, oh fuck I’m coming now.”
And she did.
She got me as far as she could inside her and then her vagina seemed to grip my cock. Those strong muscles she had in her tummy went taut and then rippled. I could feel the effect deep inside her while my cock spurted more of my sperm into her.
After that first desire to get as much of my cock into her as possible, she relaxed, then pushed back again, multiple times, while I just followed her, filling her with all the cum that I had, until I could feel only last few dribbles were coming out.
When she slowly calmed down, I could feel how wet she was as my cock seemed to be drowning in a sea of mixed cum and her juices.
“Phew, Chris, what was that for fuck’s sake?” she finally said, her body coming to rest, with just a few minor spasms passing every now and then. I lay on her, getting my breath back, my cock still firmly embedded in her.
“I don’t know, but it was amazing,” I said.
She put her arms round me and held me tightly to her, “I have never really said it,” she began, “but you know I love you too, don’t you?”
“I knew you did,” I said, softly, “but I didn’t know how much,” I said, and involuntarily my cock twitched inside her.
“I felt that,” she giggled, “I can hardly believe you are still hard inside me.”
“Perhaps it’s because, that although you are my sister, you’re also a very sexy woman.”
She slapped my back with one hand and a new blush crept up her face.
“Stop it,” she grinned, “I’m nothing special.”
“Oh, you are,” I said, planting a soft kiss on her lips and slowly moving in and out of her just once.