I must admit to honestly not seeing how it can work well in mechanical or practical terms beyond a basic level.
In mechanical terms, the girls do a boob sandwich (no doubt an impressive sight for a good deal of them) but then what? since it is by its nature happening in a manner and place not viewable or not easily viewable (since the breasts will have to met and with substantial pressure behind to push each other "in" and thus by and large cover the nipples).
So unless we turn to xray of some sort (which imo, always ends up broken) what is the difference to a classic breast sandwich?
So while an proponent of boobs, teases and what not, am not seeing right now how this would actually work different compared to old fashioned boob sandwich, which is a good thing mind you
boobs and sandwich, thats a lot of things to like