This is a unique situation, though not surprising. Guess I am surprised it
hasn't come up before. Personally, I would assist the "2nd" mother to
breastfeed if at all possible. We all know the unique bonding that occurs
with breastfeeding (Sorry Jack. When I read some of your posts I really
wish men were able to enjoy this experience the way women do), and it is
understandable that this woman would want to share that experience with her
partner. Granted, the bonding experienced with holding the baby to her
breast (even without actual lactation) may be enough for some,  but to be
able to nurture the child with her milk is apparently important to this
woman.
I think this is a "necessary risk" because it is "sooo important" to both
partners. Isn't our job as LCs to help the "mother" (or "mothers" in this
case) achieve THEIR goals, not ours?
Mary A. Banaszewski RN, Lactation Specialist