PLEASE HELP

Me

So i wore this dress last year to my 8th grade dance and i want to wear it to semi this year (new school no one saw me in it) and i tried it on (it’s next month) and it fits but my boobs went up a size (C to D) so the very top won’t zip. Is there a way I can like make my boobs smaller because I love this dress and i don’t want my parents yo waste money to buy a new one

Above picture is now and that tiny bit that won’t zip

This is last yeat