Sugar

Sugar is the beautiful, wily firstborn of a noble and illustrious queen. He tends to use his beauty to fill his den... which has given him a bit of an ego. Pair that with a sweet tongue and a mischievous streak, and his mother has her hands full. Luckily, she doesn't really care - but she does wish that he would actually study to become king one day.
When he first met the quiet yet gorgeous Firebrand, Sugar found himself a challenge that he dedicates most of his time to pursuing.
His favorite colors are pink and cherry, and his personality is "cocky and annoying to a violent degree".

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Now Firebrand is actually an assassin, but Sugar doesn't care. He bothers the quiet prettyboy as boisterously as possible for as long as possible.
Firebrand has given up on hiding and now has just started beating Sugar when he sees him - but he can't kill him, because Sugar's royal line are his best customers.
They are at an impasse for now, until Firebrand finds a better customer and then it's curtains for the richboy.