This was actually inspired by my best friend, Lobsters Are Blue, who is currently writing an eight letter series (just like this one) but from Luffy's perspective. I highly urge you to check it out!
Disclaimer: This was an idea from a writing prompt. The credits are on Lobsters are Blue's fanfiction.
I also do not own One Piece or any characters from One Piece.
Dear Luffy,
It really was great seeing you in Alabasta, Luffy. Of course, besides the fact that you hit me so hard that I crashed through 9 walls. It's quite disappointing the guy in Alabasta I'd been searching for was a flunk, but the trip there was most definitely worth it, since I got to see my bungling kid brother. Meeting your crew was fantastic as well! I still laugh at the idea that you only have a handful of people apart of your crew. It's good to know all of your crew members care about you almost as much as I do. I'd really like to meet your new crewmates (if you had any others join) the next time we see each other again.
It's amazing to know you defeated Crocodile. I really didn't know you had it in you, Luffy. It's unbelievable that my little brother actually beat one of the Seven Warlords. Saying that though, I hope we can fight each other next time we meet, just like when we were kids.
Sabo really would be proud of you.
Ace
P.S. You better remember to refer to my vivre card when we are to meet again!