His discovery of her cheating.
I could almost feel the tiny little nipple under my own tongue, and putting my basket down, I leaned back against the tree and watched from within its overhanging branches as I slipped my hand into my shorts.
The younger girl finally managed to get her sister's shorts off, and as I gently rubbed my clit I could see her plump young pussy appear- even from 10 feet away I could see the glistening of her juices. I watched as she inserted a finger into her sister's ass while rubbing her clit with her thumb, and watched the other girl's hips raise as the hammock swayed. However long they'd been doing this, they'd certainly figured out what each other liked- the older girl was moaning and gasping as the younger one silently fucked her with her small hand.
I couldn't help myself- I slid my shorts down to my hips, and wet two fingers with my now gushing wetness, and then slid them into my ass as I continued fingering my clit. Of course I came almost immediately, and then again and again as I watched the two sweet girls in front of me. After I couldn't take it anymore, I leaned up against the tree, and was standing there trying to catch my breath when I felt a soft hand touch my cheek from behind me. I turned around in shock, to see a woman who could only be the mother of the two girls in the hammock, who she was watching with an indulgent look.
"You certainly looked like you were enjoying yourself," she said with a smile.
"Um, yes." I replied- I've certainly never figured out the etiquette for situations like that, and I had no idea what to say. But since she didn't seem angry I thought I'd just go along with her lead, and since her shining red hair was hanging half way down her nicely firm ass I thought that I'd just stand and watch her for a while.
"I'm the neighbor, Susan," I said, a bit unnecessarily, and without thinking, held out my hand to shake hers. She looked at me and smiled for a minute, and then brought my hand to her mouth and started sucking on my long fingers, still slick and wet from my pussy. I gasped, and jumped a bit, and she looked at me with a smile in her eyes.
"You taste good," she said. "I've found that watching them does that to me too. They've been at it since just after their father left last year, and I really don't have the heart to tell them to stop. With just moving and not knowing anyone and me gone so often during the day, they're really all that each other has."
I nodded a bit stupidly- I had no idea what to say to this woman who accepted incest so seemingly casually, even though I couldn't disagree with her reasoning. And I was a bit distracted by the long tongue that she continued to run up and down my fingertips, looking at me with an invitation in her eyes.
No one says that I'm stupid (most of the time), so I finally moved forward and took her head in my hands. Positioning myself so that I could still see the two young girls, I began to seriously kiss her. This woman could definitely kiss- the softness of her mouth against mine, and her lazy way of running her tongue around mine was making me even wetter than I had been. I watched the two young girls move into a 69- not exactly gracefully because there's no way to do that in a hammock, but still deeply engrossed in each other. As I kissed their mother I watched as their tongues flicked out, seemingly in unison, and buried themselves in each other's pussies. The younger girl came almost right away, giving a series of little groans and lifting her head off of her sister's clit as I watched her shake.
Moving her mother's hand down to my pussy, I felt her begin to stroke me through my shorts as I pulled her t-shirt away from her heavy breasts, lifted them up to my mouth, and began gently biting on the nipples as she fingered me.