Me And My Step Sister?

So My mom and my step sisters dad recently got together and plan on marrying. I’m 17 and my stepsister is 16 and we started hanging out and got close. I became attracted to her and told her and she shut me out for a while. But recently we started hanging out again and she has started flirting with me and checking me out and just acting like she now likes me and I don't know what to do I still like her but haven’t said anything bc I didn’t want to creep her out. I think she is planning on admitting she likes me back and I don't know exactly what to do should I except it and start getting more serious bc she is super hot and I really like her and want to see where things go.
Me And My Step Sister?
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