I'm 18 and she's younger than me. What do I do?

I'm 18 and the girl talking to me at the moment is 14 and that sounds really bad but she's extremely mature for her age for me this is a problem because we're both in high school but I know she has interest and I'm definitely not planning to make a move because I literally can't. She makes a lot of weird sexual jokes like she likes to be dominated by a dude and she'd like to practice how to 'fuck' well. She does as lot of physical touching and flirting and she said she wanted my number but the thing is I'm about to leave school for University in 9 months and by the end of those 9 months she's going to want my number. I don't really want to wait because obviously in that 4-6 years she's going to get a boyfriend and I really want her to experience other things as well. What do I do here?

I'm 18 and she's younger than me. What do I do?
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