^Thinking that with her big round globes rolling up on her upper chest, breathing is less an issue than one might assume, however, the more chest space they occupy as they get bigger and heavier, I would bet being on her back would be a short lived position for Foxy. The bigger her boobs, the more difficulty she will have lying on her side, but with some strategically placed pillows, she can do it. But it has caused me to wonder, at what boob size does a girl have to abandon the missionary position because of breathing? Certainly the need to breath has to come into play at some point.