My friends older sister

this is a true story from my c***dhood, back when i was 11 years old, my best fiends sister was about 14 maybe and a very horny girl..their dad had died years earlier and their mom worked during the day leaving"Kathy" in charge. since the first day i met kathy,she was always kindof flirting with me i.e.saying i was cute or trying to hug or kiss me or just general teasing me or trying to embarras me which always seemed to work for her as i was a little shy and definately intimadated by her. i always told her to knock it off and quit bothering me but found myself secretly enjoying the attention!! as time went on, she got a little kinkyier in the things she would say to me like asking me if i liked her tits or if i would rub suntan lotion on her,{she spent alot of time suntanning] One day after school i went over to play and Kathy answered the door and said her brother wasnt home yet from school and wanted me to wait for him so i stayed. kathy said come out back by the pool i want to show you something funny, as we entered the back yard she called for their dog, a big black lab, and kathy turns to me and says"watch this" she kneels down and grabs the dogs cock and starts stroking it, the dog starts humping air and she makes him cum!! now im really embarrassed and my little dick is hard as hell and straining against my swimming trunks as she turns around{staring at my crotch} and asks me if i do that to myself? of course i told her NO! never! dont be gross! then i took off for home,by the time i got home my balls hurt so bad i couldnt stand it!! i got busy and had an orgasm so intense it had me in spasms!!! eventually, KATHY ended up moving out and never saw much of her again, i sure do miss her though!