After Allen destroyed the teacup, he stared at the king as he decided to answer the king's question.
"Surely, you jest? I have no interest in marrying Alisceon."
"Alisceon is my disciple. I treat her as my little sister. Nothing more, nothing less."
Allen straightforwardly rejected the marriage offer that the king had given to him.
Unlike most, Allen didn't use the reason of "I have a lover or wife" in rejecting a hand in marriage. After all, polygamy was not only legal but also common in this world, even in his home world.
And for Allen, using such a response was tasteless in his opinion. After all, it was like saying that you have a lover but if you didn't, you would have married Alisceon. The difference was that it sounded as if the speaker was reluctant and not firm with his response.