Jenny North's Amulet story comes to mind: https://www.fictionmania.tv/stories/rea ... 6308130479. Guy convinces his girlfriend to get breast implants (which she immediately regrets), and then they accidentally swap bodies and he has to live with even bigger versions of the implants. Not a hugely long story, and the 'dealing with them' is not continued further than the immediate scene, but a good story nonetheless.
Cheviot's classic, Breast of Times Worst of Times, deals with larger breasts as a burden: https://overflowingbra.com/download.php?StoryID=779. And also Home - BE Edition : https://overflowingbra.com/download.php?StoryID=597.