There’s a comic at Giantess Club called “Flight Hazard”, about a woman who begins to grow while a passenger on a commercial aircraft. Though she eventually becomes a giantess, the initial stages of the growth manifest as significant breast expansion.
The professional woman begins with noticeably small breasts, and is oblivious over the course of several pages as they slowly expand from small to average, then average to large, then very large! Buttons start popping and soon her blouse bursts open to reveal that she’s grown a set of big, perfect stripper tits!
