Age reversal and omegaverse au, Dunk is older and is the half brother to Daeron the good. They grow up together, Dunk is his good brother alongside Brynden Rivers, they train together, learn letters and numbers together and even share all their worries and fears with one another. Daeron names him his sword and they are always seen in each other's company, sharing stories and telling jokes. Daeron names him Ser Duncan the Tall and says he is the people's champion.
Dunk is there when Daeron II Targaryen marries Myriah Martell. He is present when Baelor, Aerys, Rhaegal, and Maeker are born. He saw them through their infancy, childhood and then their teenage faze eventually he saw them as men grown.
Unfortunately his nephews inherited their Targaryen inclination towards family members, in particular, Dunk himself. Dunk is as always oblivious when it comes to romantic overtures.
It starts with Baelor saying when he is older he will marry Dunk and make him a proper Targaryen wife, then Aerys says he'll accompany Dunk into the shared bathing quarters and read to him, Rhaegal drags Dunk into dancing and making merry all the time, Maeker challenges him everyday and is relentless in making Dunk cross swords with him. Dunk just thinks their being good Targaryen Princes and that they like to keep up with their family members in all manner of ways, he does not notice when they start marking him in their scents or when other courtiers get scared away from their overzealous peacocking.
Daeron is the one who gets to spend the most time with Dunk obviously and his children think that it is extremely unfair (screw the fact that he is king, am I right? His children think so) they whine and throw tantrums whenever Dunk is away for too long (going on political journeys to settle disputes or beat down any Blackfyre riots). When Dunk comes back his time is completely monopolised by Daeron, Myriah and their children. His only spare time is spent soothing his horses and when he goes to sleep.
