Enemies to lovers is my favorite trop. My favorite genre is fantasy!
If your looking to a recommendation here are some of my favorites (would not recommend if under 14)
Powerless by Lauren Roberts
Shatter me Series
Daughter of the Pirate King Series (this might be okay for 12+)
Ice Breaker
by PrincessCupcakeGirl
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Nevernight series features a WLW relationship that goes Friends-> Enemies-> Lovers. it’s rather dark though.
On the soft and fluffy side, This is How You Lose The Time War, more Scifi than Fantasy though.
Have you read throne of glass series by Sarah J Maas? Or his fair assassin series by Robin Lafevre
The Cruel Prince by Holly Black is a good one
Try the Freedom’s Landing series by Anne McCaffrey. It’s got mortal enemies to lovers, is funny, strong female MC. It’s aliens not dragons, but still a good read