Wanting very much to please her I did exactly as instructed. I knew what was to follow as she had me do this twice before. She said “now, unbutton a...d unzip your trousers.” I did as instructed and pushed my Levi's and undershorts down to my knees as I knew this was the next step leaving myself exposed. “Now stroke your penis slowly. Oh yes that's just right. Just keep your hand going up and down slowly. I want to see you shoot a load of sperm on the top of my desk.” She had lifted her sweater. She tightened me with her legs. I heard whispering. “move slowly!” uhh…uhhh…. oh, suck my tits….oh! She was shaking her head sideways and her eyes were closed. I was in a delirium. I continued to suck her milk filled tits and at the same time fucking her. I felt her cunt tighten and my cock stiffened. Suddenly I exploded into her. As I ejaculated I jabbered, “Mamma, mamma, my mommy!” Helen took my tongue into her and sucked hard. I gasped for air. She hugged me tightly and said, “Kiss mommy”. I. It seemed like an age that Ross and I were sitting waiting for Kirsty to reappear, however was probably only about 10 minutes, then we heard a voice from the top of the stairs. “Mooommmmy” I heard, it sounded as though she was singing for us when she calls out mommy, I rushed to the bottom of the stairs to be greeted by a very naughty site. Kirsty had found my young girls costume, she was acting and looking a picture. She had knee-high white socks, with red sandal type shoe, she had her toes. And even though she was only reading from a story, the impact of hearing her voice saying those words of invitation was almost unbearable. I longed to shout out, "Alright, alright, then! I will!" But of course I didn't.When the end of the story was reached we all laughed, and applauded, and Bill -- with Aunt Anne then taking her cue from him -- sank against the back of the sofa saying, "I'm quite exhausted!" We all roared at that.My Aunt's face was red with embarrassment, though, and she.