Awakened S-Rank Dragon Bloodline, I Went Straight to Slay Dragons

[Two male leads] + [Bloodline awakening] + [Dragons] + [The succession of civilizations] + [Straight story, no extras] I hope readers will recommend it to others! (Please don't call it Douluo Dalu! Having a new ability unlock every ten levels is just to make it easier for schools to assign grades.)

This story includes plenty of slower, quieter chapters, and doesn't have that many exciting payoffs. I'm sorry to readers who find that disappointing! (Please don't flame me.)

Dragons make few appearances early on, and the concept is only touched on briefly. By the middle of the story, though, it'll be the “dragons are as common as dogs, and the male lead has them all under his command” stage.