Mistress Gaia wanted to show her friends how to smother. Since they did not have a slave to try it on, they had to use one of them. None of them wanted to be the guineapig so the mistresses had a bet and whoever lost would be the one. One of them lost and she crushed her tits and smothered her as the others watched and learned. It was great for them but brutal for the one who lost the bet.