[Geez. Bucky isn't a particularly emotionally demonstrative person, and all of this blatant embarrassment is making him feel a little awkward. The problem is, he has no idea what to say that will make things better, and what might make things worse.]

Quit apologising.

[It may come out a bit gruff and blunt, but it's mostly kindly meant.]

I said I liked it, and I don't say things I don't mean. Besides, pretty sure poetry is meant to be listened to, ain't that the point of writing it?

[This is maybe the most he's said in one sentence, but he just wants Martin to stop flapping.]