I\'d offered to help my sister in law with some jobs around her new house , which she had bought after seperating from her ex , most of the time i was there on my own and occasionly her 3 kids were there , although being teenagers none did anything to help , the S.I.l would be the weekends and was keen to get stuck in with painting , i\'d never looked at her in any way of fancying her , but one day she was painting the skirting boards in the living room and her thong was on display all day , as she was concentrating on the painting i didn\'t even have to hide looking , i started to look at her arse a lot more and noticed how nice it looked in the tight track pants that she was wearing , and noticed her tits jiggling around as she brushed the paint on , at first i thougth she was wearing no bra , but it soon became apparant that she was wearing a sports bra , as the day wore on i had imagined pulling down those bottoms and having my wicked way but thouht no chance , after she had disappeared upstairs for a while i needed to go and put some shelves up in one fo the kids rooms , i got to the top of the stairs and as i passed her bedroom door got the best view of the day , she was just pulling her bottoms down and i stopped to watch through the crack in the door , wow what a lovly bum she had as the bottome slipped over her curves when she had removed them off came her t shirt to reveal the sports top , even that looked good on her , she turn to come out of the bedroom and i quickly walked into another room , \'i\'m just going to have a shower \' she shouted down the stairs , \' ok\' i said back \' oh your up here \' she said suprised , and poked her head round the door not revealing her body , i wont be long she said , as she turned i looked out st her walking donw the landing , and as she went she removed her sports bra , paused by the door and turned round , \' shit \' she said as she saw me watching , \' dont mind me \' i said \'couldn\'t help myself \' she raised her eyebrows at me , \' you git \' she said and disappeared into the bathroom , i thought i was in big trouble when she came out , especially when she called out to see if i was still upstairs , but she came into the room naked dripping wet , \' as a punishment , you can dry me off \' she said , otherwise i\'ll tell my sister , some punishment , i thought to myself , and did as i was told , she layed on her bed and told me to her head and lean over her to dry her off , \' but you have to strip first , she said , i want to see what sally makes such a fuss about , as i stripped , my semi hard on sprang out , Mmmmmm she expressed when she saw it , and as i leaned over her , she stuck her toungue out and gently licked my balls , this made my hardon extend out , and she started to lick the shaft up and down , i dont want sex she said , but i want you to cum all over my face , and she started to suck on me , my hands were still drying her off and when i reached her pussy , which i left till last , she was really sucking hard , i pulled out of her mouth as i felt myself stirring and stood up and started to wank to finish , she was cupping my balls with one hand and rubbing her pussy with the other , as i strated to cum she opened her mouth wide and i shot oll over her face and into her mouth , when i had done she said kiss me to finish and as i leant down and started to kiss her , she spat all my cum into my mouth , \' swallow it you dirty bastard or i\'ll tell sally \' she said , dirty bitch , nothing has happened since but she still makes sarcastic comments on front of everyone