The Royal Seasons Series by Margaret Couplet

Vance has always been the quiet twin, the one more likely to observe than act on impulse, but as Ostara approaches he discovers a desire to stand out. While his twin may have been a boisterous Winter, his Summer is no less powerful and when volunteers are called forth for a chance to win a Prince, he must decide whether he’s truly comfortable in the shadows.

Ed was never good at making friends, even before his family moved away from the small town where he grew up, a product of both his nature as an Autumn and general grumpy personality. Now he’s stuck tending his mother’s clothing stall during the Festival of Lithe, with no chance of Running in the Hunt to win the Summer Princess’s hand, but that all starts to change when he meets Clarissa, the only Summer he’s ever met who isn’t afraid of getting burned by his fire.

Amelia has never been the most powerful of her friends and has never cared until recently. In an attempt to escape the dark thoughts plaguing her mind, she decides to volunteer as a translator for a trading ship heading south. A storm throws her into the path of a ship carrying the South’s Autumn Prince and now she’s in a strange city being courted by a man so out of her league it's almost laughable.