Do your twins have their own breast?

Meagan • Twin BOYS!! #2 & #3! Due May 25th 2016. Proud mom of an 8 year old boy.
I plan on tandem breastfeeding my twins. I breastfed my son and it was rough, but, there are many reasons why I would like to do it again. When breastfeeding twins do they each have their own designated breast? Does each breast produce according to each baby's needs? What are some things you did or used that helped you be more successful while breastfeeding twins?