Shift Ch. 02

"Holy crap!" she yelled. "You're in so deep. I feel like I'm being split in half."

"Am I hurting you?" I asked.

"No. It feels wonderful. Now fuck me."

I looked deep into her eyes, our faces less than an inch apart. I could see unbridled lust in them.

"This is better than any porn I've ever seen" commented Tim. He was leaning back on the couch, his eyes wide. Eva however, had her face in Tim's lap, sucking on his now limp dick.

Eva sat up suddenly and exclaimed, "Damn it. Why can Logan get hard again, but you just stay limp?"

"Oh, I don't know. Maybe because he's FUCKING HIS SISTER!" he responded, more in awe of what was happening than insulted by her complaint.

I began thrusting in and out of Kristen's hot box. The position of her legs made her opening even tighter than it was when I was taking her from behind; it also allowed for deeper penetration.

My thrusts became faster and more forceful as time went on. I began to sweat, and couldn't help but grunt with each forward driving motion. My balls slapped against her ass over and over again, making a wet whacking sound.

Kristen began moaning with ecstasy. She pulled her head forward, a feat I was surprised she could achieve with her limited mobility, and then she kissed me. It was a wild lustful kiss. Her tongue forcefully pushed its way into my mouth, and I allowed mine to move past it and into hers. We tongue wrestled each other as I rammed by cock in and out of my sister's wet pussy like a piston. We fucked hard and fast as we sucked each other's face. My grunts and her moans merged into this strange sound muffled by our entwined tongues.

While we were kissing, I could feel her hands returning to our fused groins. She rubbed her clit furiously with her right hand and was trying to grab the very base of my cock and pull it into her mound harder with her left. My balls continued to make the rhythmic slapping sound as they slammed into my sister's ass cheeks with each thrust of my cock. It was mesmerizing.

When our mouths parted, I was surprised to see Eva sitting on our couch, only inches away. She was staring at her sister's pussy as it engulfed my prick and spat it out again, making a slurping sound with each motion of my hips. My older sister had her hand on her own pussy, masturbating furiously.

Right then, Kristen began to convulse slightly and her eyes rolled up into her head. She began to emit a high pitched squeal and shouted "I'm cumming!" I could feel a rush of hot juices as her cum slid along the length of my shaft.

This feeling must have tipped me over the edge as I felt my whole body tighten as my own orgasm arrived. I began to shoot my semen deep into my sister's womb. Shot after shot travelled into her wet cunt, then began to leak out the opening where my dick was firmly embedded and pumping more semen into her. It dribbled from her pussy to her ass, where it mixed with her own cum that was already gathered there.

We collapsed sideways onto the couch and lay there for what felt like eternity. My dick eventually went soft and fell out of my sister's pussy. We then got up and all had showers, separately. For the first time in a week, the sexual desire had temporarily left me. I was completely spent.

Tim went home after that, thanking me profusely on the way out, telling me to let him know if he could ever repay me.

That night I slept contently, knowing I would never have blue balls again.