I just read Bokura no Shokutaku. I want to read other yaoi/shounen ai where one of the characters has a little brother/sister/actual kid he's taking care of.
Try looking here
http://www.mangago.me/tag/guys+with+kids/
Oh god not another rape scene. Where's the plot? It's just smut smut smut it sucks because I was a fan of the author other works