I.i.n to be turned on by seeing my sister have sex with her boyfriend
My sister and her boyfriend were alone in our house, looking after our baby brother and I came home to find them having sex in the living room.
She was naked and they didn't notice me watching and I creeped out again before they saw me.
We have a normal sister/brother relationship. Its a bit love/hate but I hadn't seen her undressed before and she has a great body.
I dont get turned on by her as such, but I did by her nakedness and I now think a lot about her body and I cant shake that image of her being fucked.
I have started imagining myself doing to her what her boyfriend did and I feel quite jealous of him.
Is that in any way normal?
Shes 16 and I'm 22.