I was an only child and I thought I was mature enough to stay home alone, but they thought I was too young. They wanted me to be at least thirteen bef...re I could stay at home alone. Our regular babysitter canceled at the last minute for the last time. They thought of asking Brad because he was right next door. He agreed because he said he had no other plans that night. We sat on the couch together and watched movies on cable. I curled up in the blanket we left on the couch falling asleep after. That left Jessica – the instigator of tonight’s fun.She stepped to me naked and instead of bending over, or kneeling like Kristi and Brandi had done, she lifted one leg, exposing her spread and clearly wet pussy for a moment, straddled my thighs and settled in, Robin still stroking my cock, now between me and Jessica.Jessica leaned forward, her hands on my shoulders and pressed her lips to mine. I closed my eyes and let my mouth open and my tongue dart out and into Jessica’s. Her tongue met. The cool material sliding up and down my shaft, the image of my sister's pussy in that same material drove over the edge, I felt my balls begin to tighten as they started filling with my cum ready to shoot.Just as I was about to blow the door swung open and there stood my sister with a evil grin on her face, I tried to do something but I was too far gone and I started cumming in her panties wrapped around my dick. She walked in slowly as I dropped my head in embarrassment not able to think of. Plus I was always close to my grandparents. There's some old stuff of my dad's and my granddad's in it."I looked inside but didn't see anything that looked like a ledger. Then I remembered those old chests often had soft bottoms and hidden compartments. And my hunch was right. Cheryl just stared at me as I took the ledger out and then put everything else back. When I finished she asked me a question."Mr. Ritter, I know you're doing a story on Dad. Now they're saying he's a serial killer. I.