Relationship advice I guess

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Need advice on how to move on with a girl I really like.

2 days ago I woke her up by calling her that I was in a place near to where she lives. So she got up and everything and came to me. Then she just grabbed my hand and took me to her place. After her creepy grandma left for shopping she wanted me to lay down next to her, so I did. Then she started rubbing her butt against my boner and she knew it was there since she was giggling. Then my hand just slipped between her legs and I started touching her in her special area. Usually she'd hit me really hard but that time she was just cool with it. But then It got really late and I had to leave. Now she's coming over tomorrow and I have no idea what to do when she's here. I really don't want to have sex with her as we don't know each other for so long and she's underage.
What should I do if we both get turned on??