I had to admit that I was getting worried at this point. I usually floated when I sank to my shoulders. But at the same time, I had to consider the erotic show she was putting on. Even if she was my sister, watching her have her way with my mud was getting me wet. Since my head and my sex were fighting each other for control over what I did next, I decided to compromise and join her. I mean, she wouldn't have had me strip down without getting muddy, right?
I sat down at the edge of the pit next to where Emily was fucking herself silly and dipped my legs into the mud. Then pushing off, I slid into the bog and immediately felt her slick body sliding up against mine.
God this feeling was incredible.
But I had to focus. I had to keep Emily's attention off her clit long enough to realize that she was going to sink under if she kept this up. So I reached under her armpits in order to pull her hands away. I succeeded... well... kidna. I got her hands off her clit long enough to get her arms wrapped around me. Her tongue licked my chubby belly as I sank down into the silky smooth mud. Her lips planted a row of hickeys on my skin and I was powerless to stop her.
Not that I... wanted to stop her.
I never had anyone pay attention to me like this. I mean, sure I'd been with a couple of guys but they weren't interested in foreplay or anything like that. But the way Emily seemed to worship the body I was ashamed of... it made me completely forget that I shared the same blood as her. I couldn't wait to sink to her level. I couldn't wait to kiss her. I couldn't wait to get my hands on her perfect body and just ravish her with all the ecstasy she could handle.
But as fate would have it, she reached up to unhook my bra. As my belly disappeared, she licked my breasts and suckled them for as long as she could. Although this sent waves of pleasure through my body, the swiftness of the mud prevented me from enjoying it for long. She did however compensate by playing with them underneath the surface. She rolled my nips around with her fingertips, using the silky mud as a way to maximize the pleasure.
When I sunk to her level, we hesitated for a brief moment. It was as if we knew that by kissing each other, we'd be crossing a line that we could never return to. But the muddy ecstasy tugging at our bodies quickly washed our inhibitions away. Our lips locked together and our tongues fought to explore each other's mouths. We moaned from our throats as our hands felt their way downwards. For me, my fingers had easy access to her pussy. But for her, she had to slip past the waistband of my underwear to get to mine.
I struggled to keep my lips locked with hers while she fingered around my puss. I felt her fingers curl inside me and I struggled to do the same for her. Deep down inside her, I mixed mud into the juices of her tight folds. And just as she was doing for me, I curled my fingers in a desperate effort to find her g spot. I could tell from her moans that I was on the right track to making her cum.
It was all I could do since our quaking was sinking us even deeper.
I felt the mud rise up our chins to take our locked lips. I took one final lungful of air before our noses were taken as well. I felt it crawl over my eyes and the top of my head. Soon we were descending past the slurry and into the silky cocoon of the bog's depths.
It was here we attacked each other's bodies furiously. I placed my thumb on her clit while my index and middle fingers pumped mud into her as fast as they could. All I could hear in this soundless prison were the moans we exchanged in each other's throats. But still we continued in our desperate struggle. Our moans got more intense as our orgasms approached. The silky smooth depths and the mud caressing our bodies only drove us closer to the brink. The pressure around me was intense, my lungs were ready to burst, but I didn't care. As long as I could climax with my sister, I simply didn't care.
After what felt like a good minute, I popped up to the surface to take a gasp of much needed air. A few seconds later, I heard Emily's head break the surface of the mud followed by a sharp gasp. We floated dazed in the bog after our orgasms. But as I caught my breath, I pulled my arms from the mud to wipe it away from my eyes. It was there I saw her, no longer the perfect girl who could have anyone she wanted. Instead, she looked like a mound of mud from the neck up.
I smiled and wearily said "Hey sis, you look beautiful."
She wiped the mud from her eyes and said "Same to you, birthday girl."
I looked up to the sky, which seemed a little bluer now that my head was back above the bog. "How much time do you think we have before the dinner?"
She reached out to me and hugged me, replying "We should probably get back. But later tonight, let's come back so I can give you a real present."
