Just bang Hitler's mom
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Such is the nature of time travel that you go back in time to seduce and fuck Hitler's mom and guess what?
Your son is Adolf Hitler.
So the Holocaust is OP's fault?
Hitler was always your son.
Reminds me of that twilight zone episode where she goes back in time and swaps baby Hitler for a kid she found on the street without the parents noticing. Turns out that baby on the street was the Hitler we knew and she caused the holocaust.