Quicksilver's alchemy is more than set dressing, Saeris's ability to speak to the metal is the reason anyone needs her alive, and the way her power tangles with Fisher's fate gives the romance its spine. Two books pull off something similar, plus one that maxes out the bond.
When the Moon Hatched has the most distinctive voice in recent romantasy. Sarah A. Parker writes Raeve with the same unfiltered interiority that makes Saeris so fun to ride along with, and the world, dragons whose deaths become moons, is genuinely original. The plot reveals itself in layers, which frustrated some readers, but if you enjoyed piecing together Yvelia's history through fragments, this rewards the same attention.
Heartless Hunter sets its romance inside an actual ideological war. Rune is a secret witch playing socialite. Gideon is a witch hunter who burned the old regime down. They get close for mutually bad reasons, and every conversation is a minefield because each one would be executed if the other knew the truth. Kristen Ciccarelli makes the forbidden-love trope feel dangerous again, the way Quicksilver's fated bond complicates everything it touches.
And if you want the bond intensity dialed to maximum, Iron Flame doubles down on everything Fourth Wing established, the rider-dragon connection, the relationship under siege, the body count. It is the rare sequel that escalates instead of stalling.