From what I understood from what the old man said about their story, Asil admired the Captain from the beginning, but the Captain was a jerk to him. So, from what I understood, the seeds represent that admiration that faded due to the Captain's cruel treatment. And that's all, and the fact that the Captain almost died to save Asil. Besides that, I don't see any other reason for Asil to decide to be in love with the Captain.
I don't know what to say, I don't have money for therapy so I read yaoi.
