<human>: Can you give me a shortened version of the text?

My boyfriend is 20, I am 20, we have been dating for two years and I have a secret fetish.

This may seem a little 'out there' to some, but I've always had a lactation fetish. The thought of expressing milk during sex has always turned me on, and although some might abhor it, I know that there are more people in the same boat as me than they would care to admit. I'm not seeking approval, I just need some help in my situation!

My boyfriend plays with my breasts regularly and teases them during sex, which helps me to play along with my fantasy. However, many times while he is doing this I'm longing for him to say a few words in between, feed the fantasy by talking about lactation in an erotic manner. I don't know how to even begin asking him to do this.
I have toyed with fetish conversations and tried to coax him to speak about his own, the result being that he either doesn't have any or he hides them well.

When I pushed the idea into the conversation he brushed it aside as though it were something outlandish I was suggesting as a joke, and I was so embarrassed that I left it there.

As for actually attempting to produce milk, this isn't particularly on my mind. If it were to happen naturally as a result of regular stimulation then I would be quite pleased and willing to carry on as normal but I have no idea how my SO would react. It isn't a priority in my fantasy, but could prove problematic if this were to occur. 

At the moment I make do with videos online and pure imagination, but I would love for my SO to be accepting enough to work this into our sex life - a favor that I would happily reciprocate (provided he doesn't want to hurt me)! 

If anyone has any experience in confessing a fetish to a partner and has any idea how I should go about this then I would truly appreciate the help - and as I mentioned earlier, any negative comments on the fetish itself will be ignored, as I'm not seeking public approval!
<bot>: I have a rather extreme fetish and I don't know how to open up to my boyfriend to see if he would be willing to share in the experience.