I was 18 when Aunt Pat came back from Australia she had split up from her husband and returned home with her two kids, my cousins. My mother duly volunteered my services as a baby sitter for Daniel the 4yr old as I was on holiday for the summer and had no job. My other cousin had gone off to camp with the Brownies and I was sent to entertain Daniel, which was ok as he was a good kid and no bother really. We had been playing in the garden, it had been one of those summer days really hot and I had got out the paddling pool for the kid and we had been splashing and lying in the sun, when Pat arrived home from work and shouted she was going to change and would be with us as quickly as she could to enjoy last of the sun. Daniel and I were chasing about with a kids watering can splashing each other when Pat came out dressed in a T shirt and shorts. What on earth are you two up to she asked and Daniel just screamed with laughter and ran at her with the watering can trying to splash her. It all became a bit of a laugh as he chased her around the garden, then she grabbed the garden hose and said right you two lets see who gets wet now. Well she soaked the pair off us till we wrestled the hose off her and started soaking her it was then that things started to happen. Her T shirt got wet and suddenly I was conscious of her nipples showing through, they were dark and prominent and as she ran giggling about the garden I was aware of how her large breasts bounced around. It was then I started to get a hard on and as my trunks were very wet it was fairly obvious what was showing through them. I was quite embarassed and it was then Pat said ok boys thats enough time for you to get changed Daniel and off to bed for a rest. As for you she said I think a shower and a snack would be in order before you go home. We all trooped into the house and whilst Pat dried Daniel and then popped him into bed I headed off to the shower with the image of soaking T shirt and prominent nipples keeping me throbbing. Pat shouted she had laid out some dry clothes in the bedroom and to just change when I was ready. I grabbed a towel and went towards the bedroom when I saw Pat in the mirror pulling her soaking T shirt over her head, those gorgeous breasts fell free and Pat dried them then as I quietly watched started to rub cream into them spending a long time over each nipple her eyes closed as she caressed them. She slipped her shorts down next and dried her self off then again started to rub cream over her stomsch and then over her pussy. By then I had the mother of all erections and was stroking as I watched her. Suddenly she shouted my name and said don't hang about come and help me in here. I didn't know whether she had seen me but I was all embarassed, how could I go in with a tent pole sticking out? Come on she shouted I need a hand draping a towel over myself I stuck my head around the door, god there she was lying back on the bed with her fingers up her pussy slowly frigging herself. Come on she said I've seen what you have got and I need it inside me its months since I've had any. Holding out her hand she pulled me over and with her other hand ripped the towel aside ,now thats what I need she moaned and grabbed my cock and stared to wank me as she took it into her mouth. I slipped my fingers down into her pussy, god it was wet and she opened her thighs wide and I felt my fingers go deeper as she thrust against them. I moved over onto the bed and taking her nipples into my mouth started to suck and chew it, at that she gasped and grabbed my cock and wanked me harder, then she pulled me on top of her and I felt myself slide deep into her . We both went berserk riding each other like no tomorrow grabbing squeezing and kissing each other our tongues going in and out of each other mouths between moans and gasps from both of us. Suddenly it was too much and I felt myself cumming pumping inside her as though it would never stop that was it for Pat she screamed and bucked against me and came I kept pumping into her screwing myself hard against her pussy and she came again and then again till at last she fell quivering against me. I was drained and felt totally shagged out till Pat decided that we should experiment ---but thats another story