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.
Alice is 24; Jim is 19, so he was a little less experienced then she. At one point he asked for a kiss, when she said ok he kissed her on the lips (tried to get some tongue but she didn't) the kiss on the lips turned into a kiss on the neck, then on the collar bone, then the cleavage. He sat next to her on the couch with his left hand around her, and while he was kissing her cleavage he was feeling her with his right hand. First he felt her legs, then her stomach, then her crotch (through the jeans) then her left breast.
While feeling her left breast with his right hand, his left hand pulled back the top of her shirt and her bra exposing her right breast and sucked on her nipple. and she did nothing; she sat there and allowed him to.