Hey... this is the first time I am letting this thing come out of my head... I haven't told this to anyone... I am 16... and while masturbating I sometimes I imagine my sister... I know this is pretty much messed up.. she is like twice my age.. and is my blood sister... she saw me grew up and stuff... and this is pretty weird...

How many times has this happen to you? How is your relationship with her? When this happens what do you do? Also, are you a girl or boy? I think if you answers those questions you would be able to get some good advice.

I think it is weird but sometimes weird things happens.

I am a boy... my relationship with her is fine... and this happens when I masturbate...

I think in all cultures, that is taboo... sex with ones mother or sister.

Why don't you go for a few visits with a psychiatrist and see if you are heading down a bad road?