There isn't a fish alive that's half as handsome as you.

[He's talking to a merman, thanks, that's very different from a fish! Fish don't talk, for one thing, or at least not in any language that humans can understand. Maybe merfolk can talk to fish and actually understand them, though Sampo doubts that very many fish have anything interesting to say.]

[Well, if Gepard was supposed to let Sampo drown according to the laws of his people, maybe he shouldn't be so upset when he finds out that Sampo isn't exactly the most law-abiding person, either. Fishmen in glass houses shouldn't throw stones!]

Mmmaybe you should've, but you didn't! [He says it with a singsong pitch and leans back, casually propping himself up on his hands. Entirely unconcerned.] I guess if you don't want either of us to get in trouble, you'll have to be very careful when you come to see me, right?

[In for a penny, in for a pound, Gepard. If any other merfolk find out that Gepard's visiting a human, Sampo won't be the only person in trouble!]

Besides, it'll be hard for them to do anything to me while I'm on land.