How to relieve over filled breasts?

My wife is going through alot of pain right now. We had twins a month ago and at first she didn't produce enough milk... but then after about a week she just started producing more and more milk, now it has gotten to the point where she produces way too much. she had started pumping the milk off but now she says that her breasts are so sensitive now that the pump hurts alot. i have tried massaging them, but it didnt help much, we tried putting warm towel on them and it would help abit but not that much.the only time she gets relief is right after she has fed the twins. so recently when she is getting too full she would ask me to drink some off since it would be just like the twins nursing. but here is mu concern, if i keep that up she will just produce more milk to accommodate me like i am another kid, so that is not solving the problem. so how can we get her to produce less milk again? and how can we easy her pain and discomfort more effectively?