How to sneak her over?

Me and my girlfriend are both 15, we love a few blocks from each other, and we both agree that we are ready to take it to the next level, sex. But neither of our parents know about our relationship, they are both fine with us having a relationship with someone, but we are wondering how I can sneak her into my house at night without being caught, and out in the morning without getting caught.
How to sneak her over?
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