Iniss is this disgusting, disgusting thing to Merlin. But that's...pretty much it. He doesn't like Iniss, isn't interested in talking to Iniss, and pretty much considers him this thing that he has to try and protect Tom from.

Tom, he doesn't know that well yet (though I imagine he'll get to know him...), but he feels a lot of pity for Tom. He's also under the mistaken impression that Tom must be an honourable person, because he was so insistent on keeping his promise to Dani. (He also thinks that while 'noble', choosing to take Iniss back is really stupid)