Rudel, the first-born son of a corrupt ducal family, saw a dragon-rider when he was five. At that moment, the destined corrupt nobleman villain of a harem VN/RPG disappeared into the aether and a dragon idiot was born.
The craft of the plotting and story isn't the greatest, but Dragoon is still an enjoyable light comedic read. The closest I can think of in this vein is Gifting, except the main character is not a depraved tsukkomi this time, and the absurdity levels are a bit lower.
There are a couple of tearjerkers. Cheap ones, but I kinda cryd.
As for the otaku-patheticness quotient of the story, happy to say very low: no slavery, no actual harems really, and Rudel remains oblivious. Although I might need to mention that besides some level-up skills and being OP in general due to training as a dragon idiot, he's also picked up a book about dragon petting, integrating magic and all sorts of things... And this dragon petting skill is lethal (in a la petite mort kind of way) to people when used on them, so there's lots of implied mostly off-screen petting ecchi in the story, as applied by our oblivious MC. Eventually, the whole dragon petting arts takes over as the impetus of a lot of the plot... In a good way, I think
Ah, that last one reads as if this is an ecchi novel. It's not. The dragon petting plot things are more like martial arts plots.