The Saline Solution by Caitlin Whitaker

Ethel Klyczek’s development stalled in middle school, making her self-conscious and insecure. Aiming for prom perfection, Ethel plans to go from As to Cs, and she doesn’t mean her grades.
Ethel’s parents are dead-set against her self-improvement plan. Without their sanction, Ethel will have to do a lot more than sling fried chicken if she’s to get a new set of twins in time for prom.

Extreme fundraising of car washing, cupcake baking, and t-shirt selling starts out strong. But as the money rolls in, Ethel’s support system rolls out. Her best friend is sick of her too-busy schedule and preoccupation with her boobs, and her boyfriend is tired of fighting other guys for her attention.
With her grades dropping and her family at the breaking point, Ethel plans an epic rager to push past the finish line. The party is a massive success, but the invite to view her A cups draws a crowd Ethel can’t control.

Now, the question isn’t if she can earn the money for the surgery; it’s whether or not she can live with herself when it’s done.