Suck It Step-sis!

Finger still to my temple "I want you to suck your big brother's cock."

"Mm, now we're talking!" she strokes my cock as she takes a few deep breathes. For a moment I wonder what she's doing but my question is quickly answered as she takes a final deep breath holds it and drops under the water.

I watch her head drop under the water, she grabs my ass and before the water clears enough for me to see exactly what she's doing the cool water on my cock is replaced by the warm feeling of her mouth around my cock.

I had thought we'd go to the side of the pool or the steps but she took my command directly. I watch her pull her self towards me under the water, my cock slowly disappearing into her mouth, a few bubble push out her nose as she takes my throbbing cock into her mouth. The feeling is amazing as she bobs in slow motion on my cock under the water, every time she pulls away the cool water rushes in around my shaft. I feel her tongue swirling around the head of my cock. She pushes off my cock and the cool water rushes around my cock as she pops up out of the water. As she comes up she shakes the water from her face and takes a sharp intake of breath.

"I have to admit I've always wanted to try sucking cock underwater. Big Brother I'm going to need your help though. I can't move underwater very fast so, if you want to, you can grab my head and fuck my face." She says almost innocently, the gleam in her eye and the hand squeezing my cock tells me it's a request more than a 'if I want to'.

"Ok, but you push my hips back if you need to breath." I say still a little concerned about drowning my step-sister.

She take a few deep breathes then one final big breath and drops under the water again. I take hold of the back of her head and feel her put the tip of my cock to her lips. She wraps her lips around my cock and slides forward on my cock. I push her head down on my cock as her hands find my hips, I feel the back of her mouth close and deny me access to her throat. I pull out and push in again this time her throat relaxes a bit and I push the head of my cock into her throat. A few bubbles escape. I pull out again and push the head of my cock back into her throat again. When I feel her fingers squeeze on my ass pulling me in I take advantage of the signal and slowly pull her head down on my, pushing my cock inch by inch down her throat. I feel her lips around the base of my cock and her throat pulsing around the head, it feels amazing. I pull out to her mouth and then shove it back down her throat, all the way.

I guess this surprised her as suddenly there are a ton of bubbles and she's pushing my hips as hard as she can. I feel her throat convulsing around my cock as she pulls off of it. She pops out of the water, gasping for air.

Breathing heavy to catch her breath I look at her worried. But then she surprises me, and says. "Oh fuck! You caught me by surprise there! gasp. But fuck that was hot! This time don't go slow, just shove it in and fuck my throat, don't let me up till I squeeze your hips, even then take a second or two." She says with a dirty grin on her face.

Again she takes a few deep breaths then holds one and drops underwater. This time she wastes no time and grabs my ass and pulls my cock into her mouth. I put both hands on the back of her head and shove my cock down her throat, only a few bubbles this time. I start fucking her throat as fast as I can in the water. I watch as her body slowly floats up behind her, her legs kicking pushing her forward every time I shove my throbbing cock down her throat. I fuck her face and watch her ass.

She starts pushing my hips and I keep thrusting down her throat, I can feel her throat tightening around the head of my cock as her body starts trying to draw breath. A few seconds later I feel her throat starting to convulse on my cock as she starts squeezing on my hips. I pull her head till my cock is so deep my balls are on her chin and holds her there for a few seconds, feeling her body reflexively sucking for air but only getting my throbbing cock.

I finally pull her head off my cock and pull her up above the water. Her eyes roll back in her head as she gasps for air. I reflexively pull her towards me holding her body in the water hand wrapped around her shoulder and the other around her hips grabbing her ass. I watch as she coughs and watch as her big tits heave up and down with the deep quick inhales.

As soon as her breath returns to normal her eyes roll forward and look up at me, "Oh my fucking god that was hot!" she grabs my hand on her ass. "That made me so damn wet," She shoves my hand between her legs pushing her bikini bottoms aside. She shoves two of my fingers into her tight hot pussy, "can you feel how wet it made me?" she looks up with an obvious enjoyment of my fingers in her.

"We are going to have to practice that one, I think I've had my fill of underwater blow jobs today. Lets move to the side." I feel her fingers wrap around my cock and start slowly stroking as she shoves my fingers in and out of her rolling hips. I walk us over to the side of the pool, supporting her lower half by literally nothing but my fingers hooked in her pussy.

She pulls my fingers out of her pussy with a moan as we reach the side and puts her feet down.

I still want to make you cum big bro.