Your girlfriend is about to head to the gym, but realizes she forgot to do something... what could it be? She comes back a second time, and something seems... different. She's changed into a different sports bra, and something certainly DOES look different- her BUST! Is it growing? You keep getting harder every time you see her... until soon, you start jizzing right in your pants! Oh no! But you can't stop... and she keeps getting bigger! Soon, they've gotten HUGE and you start cumming multiple times without a single touch- and she reveals her secret. She took a magical pill that enlarged her breasts and gives her control over her pheromones! Looks like you'll never be able to resist your cunning GF and her huge boobs ever again!