No bra with baggy shirt! Is she leaning over in front of me on purpose?

Anonymous
My girlfriends sister handed me her ipod to look at something and im looking and she leans over in front of me to look at the ipod too and i looked up and see doen her shirt and she isn't wearing a bra. She does this same thing multiple times and than as we are leaving she comes to the door to say bye. I can't remember her ever doing that before. But she did but how she did it. I was standing down a few steps and she is in the door and she is leaning out pretty much just letting me have a full view of her breasts. Im 23 and she is 16 her sister im dating is 21. Is she doing this on purpose or am i looking into the situation to much. Do girls pay attention to this? Why would she do it? What should i do?
Updates
+1 y
What should i do if she is attracted to me? Do I tell my girlfriend what happend?
No bra with baggy shirt! Is she leaning over in front of me on purpose?
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