Hello, as our member has answered, someone can not get pregnant in this way. This should answer your question and we are now closing this thread. We wish you the best.
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Your brother would not have masturbated into his hand and applied sperm to a doorknob, sperm would not survive on a doorknob no matter what the brilliant PhD sperm scientists who regularly write on the Internet say, you would not have touched a wet, sperm-coated doorknob and directly put your finger into your vagina, please leave your brother out of your fantasies if you can.