The knight, the princess, and the prince (a Hetalia love triangle fanfic)

Some things before the description:

1• NO HATE PLZ

2• There will be separate endings for each one

3• Hungary will not be in love with Austria, she will be in love with Prussia instead

4• Human names will be used.

5• I will not do the accents

One faithful day in Prince Roderich's (Austria) kingdom, the palace was attacked, and the king and his knight were killed, leaving his brother, Ludwig (Germany) to take the throne. Because of the attacks, Roderich has been assigned his own personal knight, Gilbert (Prussia). Complications arise however when he begins to get feelings for his knight, even though he is already engaged to princess Elizabeta (Hungary). But when she starts to fall for Gilbert too, what outcome will there be?