«فِي النَّسَبِ فَرْخِي وَفِي الْمُكْتَسَبِ فَخِّي»
By lineage he is my fledgling; as a means of gain he is my snare.
A one-consonant pun moves from fledgling to snare. Abū Zayd openly describes the youth as both his son by lineage and a tool of gain; the trick exploits the ruler’s interest in the young man’s appearance.
Kinship does not by itself license manipulation of another person for profit. The verbal cleverness reveals the scheme, but it is no moral defense. The line exposes how affection and instrumental calculation can be combined in one character.