For the person ( sorry, I forgot who and can't find your post? ) wondering if you can suck milk out of tits with a "Snakebite Kit", here is a link to a blog of one woman who claimed she was able to do it:

Here is a link from a woman's blog who is into titty torture. She said that she used a "Snakebite Kit", and put the cups on her tits for 1 hour and 30 minutes straight, and doing this not only made her nipples HUGE, she was able to suck milk out of her tits as well.

It is the 1st link below.