My wife breastfed another man...
It started with her pumping her excess milk, and selling it to a neighbour. I said she could make more if she'd let him "drink it from the tap", and she told me I was disgusting for even suggesting it, but it must have planted the idea in her head, because a few days later she asked me if I really thought someone would want to do that, and I told her of course they would!
I didn't hear anything for a few more days, until she asked me whether I'd really be ok with her doing it, and I told her that I'd love it.
About a week later I got home to find her on the couch in a sun dress, one tit out, with our neighbour slurping away drinking her milk, with a massive tent in his trousers, and his hand on her thigh!