Prince Lorne, whom everyone thought a freak, was doing just fine on his own in the castle, until Sebastian appeared.
"I will be forever loyal to you, Your Highness." (He drops to one knee.)
Lorne: ...
Wait, that's not right...
How on earth did this man climb up to a castle thirty meters tall?!
Sebastian, a seemingly loyal but actually scheming knight, x Lorne, a tsundere little prince with a sweet tooth.
An alternate medieval setting. Many details probably won't stand up to close scrutiny.
There may be a tiny bit of angst in the middle (?), but it's HE.
Theme: Saving each other, helping each other flourish, and becoming better together.