All your life, you've been taking care of the cows on your farm, so its basically your everyday occurrence. Even when your sick, your parents made you wear a surgical mask, while you hook the milking machine up to each cow teat, and turn it on to get the milk out of there udders so you can get it in bottles.
Just then, you also had a realization. There was a reverse switch on the milk machine, and you don't have the breasts to impress Biff the lawnmower guy. So you decide to borrow the leftover milk the cows were making, along with tubes connected to the machine. With that in mind, you take off your shirt, unbuckle the suspenders from your overalls, and connect the tubes to your nipples while noticing milk reaching them. To your amazement they actually worked, causing your breasts to grow.