Responses
not exactly what you asked for and this one's shounen ai but the uke is shy and sweet (although i won't really consider dumb)
http://www.mangago.zone/read-manga/false_memories_lee_gpiee/?aqev
just thought you might give it a try if you haven't
any yaoi mangas with dumb/idiot but sweet/wholesome ukes??? as an example, someone similar to natsuo from the proper way to write love??? those characters are just so endearing to me and i want to read more (づ￣ ³￣)づ