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yes it is
yes it OK if she wants to blow her brother and he wants it + its not illegal
only in Arkansas
It is not recommende for brother and sister to breed because they have the same DNA and can result in issues with the babies(kind of like humans). However this may sound strange, but it is ok to breed mother to son and father to daughter.
Most prefer it to being an only child.
Yes
if the attention is wanted then flirt all you want
no sailor moon didn't have a sister she had a brother you know for more information wathch the anime ok>?
Calling her by her name would be okay. Ask her what she likes better.
not really but if u r that desperate for that sort of thing then just imagine it
As long as you do it as brother and sister and not as lovers, yes.
Of course it's ok to love ur brother and do stuff for him it's ur brother ur supposed to love him! so yes it is ok and if people dont think ur cool for it just ignore them ur a good sister!