At this point, it is quite unanimous that you have to write a sequel. As a boring twinkish lawyer I have no right to suggest how you should continue your astonishing work, but I will give you my ideas anyway.
I would make a hiatus in the story, at least 4-5 years and i would open with the day before the marriage: AJ, a worldwide bodybuilder champion (and one of the very few openly gay) marrying his long-term boyfriend, a writer (who accidentally happens to have written a novel about their love story, which is the story we are reading) who after his graduation and a PhD on the representation of the male body in the literature from Homer to Oscar Wilde (or something like that) has gone living in LA with his professional bodybuilder's husband-to-be. To make it short, AJ just wants to be the first gay bodyb. to win the Olympia but has already decided that he needs to make something more substantial (than his 280 lbs of pure shredded muscles) getting an LLB and an LLM in MBA before going to work in some financial corporation or some IT newco somewhere in California. Dumb jocks might be hot, but smart and educated ones are even better and are less banal.
I would like to read their everyday's life, their growing up as a couple during the years surviving together the loss of their parents (Noah's mother dies from cancer after a long battle assisted by her beloved son and her equally beloved [almost] son-in-law whom she blesses with her last breath) and overcoming the deep insecurities that for different reasons afflict both AJ and Noah.
Coming back to the marriage, I would also put some pepper in the story and I would like to read the pain of AJ tailor fitting the suit for his marriage and some "oh crap" moments where he forgets how big he is straining too much his clothes.
In synthesis, I would like to make me cry, to excite me, to make my heart beat at the rhythm of our beloved characters. I have no authority to do so, but I forbid you to abandon your story. I want an invitation to AJ and Noah's marriage (and I have some ideas for the proposal too.... maybe somewhere in a certain Tesco and a ring enveloped in a bodybuilder's pink poser?).
Enjoy your Christmas than start writing again. Marsh!