We were in my bed. She was sitting beside me with loose hairs. I was teaching her some speed enhancements to save time in exam. She bent little forwar... and solving the problems i told her. I turned towards her. This is when i felt little uncomfortable. I can see her light pink bra and some cleavage. I turned around. But by that time my junior woke up from his sleep. And it was his time to make decisions. I was watching her cleavage and bra. Her pink lips, i felt like grab her and bite her lips.. A primal panic filled me. I ripped my cock out of my sister's pussy. Mom's keys fumbled with the lock. She would be in the house in moments. We had to do something? I looked at our clothing lying on the floor, my sister gasping, her blue eyes wide.“Clothes!” I bent down, scooping up as much of hers and mine I could. “Then...bathroom.”There was a first floor bathroom down the short hallway from the living room to the kitchen. The front door opened. My sister and I, holding bundled clothing,. If he’s willing I might ask him to keep an eye on you when your dad and I aren’t around. You’re too old for a sitter.”“That’s for sure mom. Plus I’m sure he wouldn’t mind.” I said grinning into the refrigerator as I looked for something to drink. “Mom, could I have a coke with dinner?”“Yes, I suppose so.”“I’ll have dinner and then go to my room and read, I got a new Mickey Spillane novel.”“That’s nice honey. See you tomorrow.”I laughed and dipped a small amount of chowder into a bowl and put. Watching her masturbate so uninhibitedly made me want tocome with her, and my fist started to go into overdriveon my dick, jerking faster now, and I felt my climaxcoming again.“Ohhhh….,” Patty breathed, “…cumming…” she panted,and then her face wrinkled as the convulsions of herclimax welled up in her body and she began to experiencethe sweet release of her orgasm. Her eyes glazed,exposing the depth of her pleasure, and then her mouthformed the long.