My niece who is 21 and on the in law side of the family has recently come "out of her shell" throughout college. She is very attractive, long legs and a great ass. Over the last year or so, I've noticed that she has become more flirty towards me. When I see her she will do things like repeatedly rub her foot on my legs and say sorry with this little grin on her face and a few times she has accidentally "tripped" while walking by and will fall to where her hands are on my thighs and give me a little smile.

I've never thought of her sexually until recently. She has been posting some very provocative picture on social media (no I won't tell you her name) that I have jerked off too, again, amazing ass. But now I can't stop thinking about it and I want to make a move. How do I do this without anyone finding out?