Enjoy your relationship with your boyfriend and don't worry about the people or situations you dream about. Once you wake up, they're over; let them go.

Anyone who wants to pretend that your Huntington's disease is an invention is someone who does not have your best interests at heart.

I think that it's a great idea to have honest conversations about children before getting married. I also think it's impossible to promise someone, "What I want right now will never change, and as long as I promise you I do - or don't - want a child - or a specific number of children - before we get married, we will never have to experience fear, anxiety, uncertainty, or the pain of not getting what we want, when we want it.

You have a wonderful opportunity here to not care about something that doesn’t matter to you. Please don’t miss out on it.

Someone who has a disability is not necessarily in distress. You may be embarrassing and inconveniencing someone by butting in and making assumptions.

Tenancy laws can be so complicated; I want to make sure OP is protected as much as possible.

If this is something you'd truly like to work on, not out of a sense of guilt but because you would enjoy occasionally reciprocating, there are a wealth of resources out there for the enthusiastic amateur (you are far from the only would-be blow-jobber whose spirit is willing but gag reflex is weak). You have more options than "no blow jobs, ever" and "regular whole-hog sessions to completion that result in vomiting."