@ megha : cool fantasy.
why your story doubtful
(1) you mentioned the notorious site netfundu, which was marked by google as "harm ful site".
u appear to promote that site which caters fantasies of boarders which are lavish and sadistic nature.
(2) u said your sister 15 year older than u, ok.
then she should be 39 year old.
is she still unmarried and stays with your family.
(3)everyone knows to hurt a person to fuller extent, is to slap on cheeks and not bottoms.
unless the the executor is lesbian or allied.
grow up man(i even doubt u are a lady).
golfer