My Sister Is My Dom Pt.3

On Friday, I woke up in Fiona’s bed with her spooning me. It was a warm morning and we didn’t have a sheet covering us. She had one leg draped over me and her hand was in my crotch. I had a huge morning hard-on, but I also had to pee urgently so I slipped out of the bed as quietly as possible to go to the bathroom. Fiona woke anyway, but only opened one eye.

“Where are you going?” she inquired.

“To the bathroom, I really have to pee.”

“What time is it?”

“A little after ten,” I answered. She was asleep when I returned from the bathroom so I went downstairs and made coffee and breakfast. She came down after the aroma of the freshly brewed coffee had wafted upstairs.

“Why didn’t you come back to bed?” she asked. “I would like to have had sex before I got up.”

“I was hungry,” I answered. “Besides, my dick is getting sore. We’ve been going at it constantly.”

“My pussy’s sore too, but you don’t hear me complaining. Mom and Dad return tomorrow and who knows when we’ll get to screw again with them hanging around.”

“We’ll do it today, and tonight, and probably tomorrow morning before they arrive. Let’s just at least have breakfast first.”

“Alright, breakfast first, but then we go swimming. I want to feel the cool water on my skin. It’s getting hot already and it’s not even noon yet.” We finished breakfast and watched some television before Fiona grabbed me by the hand and pulled me toward the back door.

“Fi,” I said as I stumbled trying to regain my footing, “we don’t have our swimsuits on.” Fiona had on her oversized tee shirt and I just a pair of boxers.

“We don’t need suits, just towels to dry off with when we get out.” With her free hand, she grabbed the towels off the back of the couch where we had left them the day before. She dragged me and the towels to the deck then pulled off her tee shirt. As usual, she wasn’t wearing panties or a bra. She jumped into the water. I stepped out of my boxers and dove in after her.

The water was cool, but refreshing. I came up about ten feet from where Fiona was treading water and she immediately swam over to me. She put her arms around my neck, planted her lips on mine, and thrust her tongue into my mouth, kissing me passionately. I returned her kiss and sucked on her tongue as we both began to slowly sink below the water. We kissed underwater for a few moments before I gave a strong scissor kick to propel both of us back above the surface.

She stopped kissing me and looked in my eyes as I treaded water to keep the two of us afloat. “I want to fuck right now, in the water,” she said softly and provocatively. Our faces were mere inches apart and I looked deep into her hazel eyes as she held her arms around my neck.

“Of course,” I replied. I couldn’t refuse her. Not because she would make my life miserable with Mom and Dad if I did, but because when I looked into her eyes, I wanted to do whatever I could to please her, and she was doing the same for me. In the span of just a few days, we had made a special connection with each other we had never realized was possible.

I side-stroked and swam both of us to the floating deck where I could hold on and keep us from sinking. Fiona continued to hug my neck and locked her lips to mine again. She kicked to help propel us and every other stroke or so, her thigh would come up between my legs and nudge me in the groin. Her soft, smooth skin and firm muscles rubbed my inner thighs and pressed against my cock and scrotum as I kicked through the water. It sent a euphoric sensation through my groin and made me hard.

I grabbed onto the deck first with one hand, and then the other, placing Fiona between the deck and myself. She reached under the water with one hand, grabbed my now rock-hard dick, and rubbed the tip in her pussy crack. I felt her wetness on my glans as she slid it from vagina to clit, her labia enveloping the entire head of my dick. Although I was extremely horny, the contrast between the warmth of her pussy and coolness of the water kept me from cumming too soon.

She began using my cock to stimulate her clit, rubbing the glans across the tip, and then circling it around the base of the engorged little button.