Basically mc being a strong knight under the king, she caught the attention of the second prince, the king's brother after they spar and found out they were same in strength. Warning that it contain R*pe and forced relationship... He forced her the night during their first survey in the kingdom. MC has a feeling for the king and the ML know it. He used his voice similar to his bro and things go ya know
The Strongest Knightess Cannot Escape An Obsessive Prince!