Fic title, link: Blue Eyes: http://www.ratandfox.net/ff/YGO/blueeyes.html
Fanfic Author: Cody Nelson
Summary: Seto Kaiba is the typical mal-adjusted genuis child, forced to grow up way too soon. He's having a hard time accepting his Battle City defeat against Yuugi, and on top of that, he's been finding himself unnaturally attracted to his eleven year old baby brother Mokuba. Kaiba creates his own sexual virtual game to fight his urges, but it seems to cause more problems than it helps.
In brief, why you like it: It's one of only two fics I've found for this particular brotherly duo that wasn't written in the spirit of Seto + Mokuba = hawt ghey boi incest secks. Kaiba does what he does to avoid harming his brother--the only person in the world he cares about, and Mokuba is refreshingly in character, being a bit more mature for a child his age and yet still a bit innocent. Yuugi helps a little, but doesn't solves everything for Kaiba, which is also good.
Fic title: All That I've Got, http://www.fanfiction.net/s/3046627/1/
Fanfic Author: Genjo-Fujimiya-Houshi
Rating: K+, or PG
Summary: Young Mokuba knows his feelings for his adored big brother are more than brotherly, and he doesn't quite understand why that is.
In Brief, why do you like it: Easily the best characterization for a person that is almost always botched in fanfiction. Incest factor aside, it's a great character story about the admiration and love tha Mokuba holds for his brother, in spite of the...er, shall we say less than nice things Kaiba has done in the past. And I nearly cried at the end of this one ^_^;; NOTHING in fanfiction makes me cry anymore...unless weeping for fandom counts. But I cried in a good way here.