This is a true story...
Last night my g/f had a friend over, we'll call him Jim, she had never met Jim before in person, they had become friends online and wanted to hang out. He came over last night and they hung out in the living room. I stayed in our bedroom, as I had no interesting in hanging out with this guy. I wish I was able to see what happened, but I did not. This is what Alice told me happened...
Alice wore an extremely low cut shirt with a black push up bra, and skintight jeans (I had been encouraging her to wear something really revealing for him, and to find an excuse to take off her top all together.) The shirt was low cut down to her bra line; she wears 36D size cut, so with the push up bra and the low cut top, Jim was enjoying quite a view.
They sat on the couch and talked and had a few beers. The whole time Jim was making to attempt at hiding the fact that he was starring down Alice's top. Jim knew she had a b/f, but made it clear he wished she didn't. He continued flirting with her in that way.