Just what is that little mouse looking at, eh?
Poor Tilly is just trying to get ready - brush her hair, find her jeans and squeeze herself into her bra - when all of a sudden she's startled by a mouse! It seems pretty harmless, but at the same time, it seems quite content to just and stare up at Tilly, for some reason. Perhaps it is hoping that in her hastened distress, our well-endowed damsel will accidentally release her arm-bra, allowing that fabulous pair of plump, weighty breasts to hang free. Or maybe it is just a mouse and it is hoping she has some cheese or something?
As an aside, there has always been something very captivating about a hand or arm-bra. It is perhaps the last layer of teasing titilation before a final reveal. There is another perk; the hands provide an excellent sense of scale to how large a pair of breasts actually are. At some point, a hand becomes almost unable to contain so much flesh, the frayed the edges of an over-stretched areola beginning to show. Even an arm can only hold back so much, and both arms may be needed in certain cases of excess (such as in You Bust It, You Buy It or Anything Less Than Two Armfuls is a Waste). Even then, both arms will only hold so much...
For the moment at least, Tilly can just about contain her huge bosom with one arm, but as for how much longer we just don't know...