Context : Hunter started talking about the portal key with Titan's blood is to simply annoy Kikimora but he didn't think that his decision to give her the key back at Eclipse Lake would have this much influence, when he said "Must be the Titan that help you" he implies something like "Yeah don't forget who helped you there", but again he does that only to annoy her and wasn't expecting her to say a very strange and not obvious way thank you as she did.
And yeah about the "He might be worried but not that worried" part...I wouldn't be so sure about that Hunter because Belos did meet Hunter at the very castle doorstep cause he was worry about his boy coming late and needed to make sure nothing bad happens to him and no this couldn't wait until Hunter got to his room or came in the throne room, why Kikimora decided to cover Hunter, after Eclipse Lake she also think Belos is strict and harsh on Hunter as he is on her, so there's a part of solidarity.
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