Aion thought his father that he wasn't interested in anyone. Usually, few people in the kingdom would, but now that he was so famous like that, some will try to win him over with the prospect of marriage. The ones interested in his strength would be the heads of many families, but they will use their daughter to seduce him. Once that happens, Lexus said that he would have to be firm in the refusal. Otherwise, they might keep coming.
"Easier said than done…" Aion thought while he was heading to the castle.
Although Aion dislikes most nobles, they have a sense of duty, and even if they dislike his lineage or fear him, some women or girls will follow the orders of their fathers or grandfathers and endure that kind of thing. Aion hated that kind of situation since his mother was forced to endure something similar. She probably didn't suffer a worse fate because Lexus still had his honor.