It seems that I have overactive letdown, as one of my twins continues to choke/cough while nursing and the other just unlatches until the flow becomes manageable.

I've read about block feeding, but I don't want to reduce my supply - I need to feed two!

What else can I do to keep my little guy from choking during every nursing session? It scares the crap out of me and can't be very pleasant for him!