Artist's commentary
Animation director checks it
This is probably no good, but Segawa-san's chest is a decent size, and I got to thinking she might try to recapture their youth like this. "They ain't saggin' yet are they? Maybe this'll help!"
tl note: The artist actually has her thinking "シャッス!" which is an abbreviation of お願いします (I'm in your care), and she's "saying" it to the ribbon.