>>25552277
For the same reason, you have nipples.
Every man can lactate, you just don't have fully developed mammary glans, but give you enough estrogen, and voilà.
>>25552287
It doesn't last much though, most trannies just lactate for a brief period of time.
I do assume there are methods to extend it the same way some women are able to lactate without pregnancy.
Reminds me of a men who just got a fucking MLP doll drowning in pure semen, i can't find the video (thanks to God), but that thing is fucking disgusting