no no no no. Unless you masturbate on something and she somehow gets it inside her vagina, you're fine. If you didn't wash your hands and you touched a doorknob that she later touched, there's nothing to worry about. Sperm don't last long in a harsh environment anyways.

She can not get pregnant through masterbation. Only through intercourse(sex)

Sperm do not live that long, especially out of fluid (on a towel, sheets, doorknob... whatever ). It is next to impossible for sperm that is ejaculated outside of a woman's body to find it's way back in and up into her cervix, anyhow. Unless you ejaculated a huge amount right onto a tissue or something that your aunt then came into the room, immediately used, and pressed rather deeply into her vagina, I'd say you could bet your life that your little sperm couldn't possibly have created a baby.

Silly boy

Also, reguardless of what people shoved down your throat in eighth grade health class, it is not *that* easy for a woman to become pregnant. We aren't walking, talking, baby making magic machines. Typically, there are only 3-5 days a woman could possibly become pregnant during any cycle, making a single act of intercourse (I'm talking reeeal guy-on-girl, ejaculation-deep-in-the-vagina sex here) have only a 15% chance of resulting in a pregnancy. That said, that's just what the numbers say... and we all know that there's more to life than statistics. So of course we all need to be careful and take precautions against unwanted pregnancies... but those are the facts.