Remember the old (maybe) proverb;
"A Stretch of the Back,
Is Good for the Rack
And a Flex of the Shoulders,
Helps Carry the Boulders!"
Breasts, even rather substantial pairs, have a fascinating ability to change shape almost constantly depending on the bearers stance or position. When heartily stretching with arms above the head, for example, it has great affect on pulling the breasts up, helping to 'uptilt' even quite large, heavy boobs. Indeed, I believe it is quite a popular pose with many bigger-bosomed models both proffesional and amateur, as it gives the effect of the breasts being fuller and more pert than they would otherwise be - not that it is a problem, as I said, one of the most fascinating features of huge, heavy breasts is how much they change shape and form in respect to the bearers position or movement. As she stretches, it also forces the shoulders back and the chest up, allowing the breasts to spread apart slightly and the nipples to haphazardly point outwards a little more - it is most certainly a look I adore!
I'm not sure whether our protagonist here is just getting up, or has just taken her bra off and is getting ready for bed. I can tell you, however, that stretching is incredibly important for anyone carrying extra weight on their frame. Star jumps and running would most definitely be out of range for a girl this blessed, even fitted with the most supportive of bras, but stretching goes a long way to helping reset and strengthen those tired muscles. One thing is for sure - carrying those ample assets around all day will make sure she sleeps well at night!