Warning: Rant Ahead.
Because I'd heard so much praise for Bottoms Up, and because I love Spamano so much, I finally caved and read it. The plot is a bit far-fetched, the chapters are unnecessarily long (the length is mostly due to line breaks, not lengthy descriptions, which annoys me greatly), the style of writing was not suited for this type of story, and the characterization was just... horrendous. I feel as though the author purposefully made everyone in this fanfic some kind of flanderization of their original character. Romano is just completely annoying and one-dimensional, Spain is vapid and his love for Romano is unrealistic (like in the chapter where Romano says all those terrible things about Spain and his people, for no reason, and Spain forgives him instantly. That doesn't happen.), Hungary has been reduced to nothing more than a yaoi fangirl, Belgium has somehow been made into one of the bad guys (that Spain also instantly forgives, AND EVEN BLAMES HIMSELF, despite knowing that she was using him! THAT. DOESN'T. HAPPEN.), and even poor Feliciano got turned into an annoying and stupid character, who even the "ever cheerful" Spain is a jerk to. (For no reason!) As for the smut, which was really the basis of the story, I believe that it's the only reason that most people continued to read it. The smut was well done (save for a few mishaps here and there), and as such, it kept the readers coming back for more. For me, those were the only good parts of the story.
All-in-all, this fanfic was really not worth the 80 chapter read. It's essentially a stereotypical Spamano fic, but drawn out for 80 chapters.