14 year old girl flirting with me?

Anonymous
First off this girl is the 14 year old step-daughter. Of a close friend of my father's. And I am 21 years old. She used to never really talk to anyone. Then recently after a joint family trip she starting to talk to me alot. On this trip she went out of her way to talk to me. She now dresses with these really low cut shirts. I will be talking or on looking at my phone. Look up and she is leaning over with her cleavage almost in my face. She even sometimes does this with no bra and loose shirts. She now has my cell number somehow. She started sending me flirty messages. It is not like she is unattractive. She is tall and in good shape. Also very developed for her age. As she has already told me in a text she is a D-Cup. My cousin says go for it. It is the age difference that has me worried. What should I do.
14 year old girl flirting with me?
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