My boyfriend's dad stares at my chest when I talk to him?

I have been with my boyfriend for 3 years, living together almost 2 years. Anyway, I met his dad the first month we started dating.

So, his dad blatantly stares at my "assets" when it's just me talking to him sometimes... one time, when he was talking to my boyfriend and walked out of the kitchen, he looked me up and down with my boyfriend right behind him! I was shocked that he was so bold! My boyfriend didn't see.

I don't mind the attention, especially since my boyfriend and I have had a rocky few months. The stress of work and school are eating at me and him not helping around the apartment and giving me attitude/anger out bursts doesn't help. I don't mind his dad staring at my bust or anything but... am I supposed to respond to this? Like I really don't know how to. I have acted indifferent. He has not passed any boundary either. Ain't gunna lie, because I miss my boyfriend giving me that kind of attention, part of me wants to tease him. He won't act on anything, nor will I. At least, I strongly feel he won't. But, is it wrong to have a little bit of innocent fun? To tease an old dog who hasn't been with a woman in years? Or... should I act "offended" at him looking at me?

My boyfriend's dad stares at my chest when I talk to him?
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