Have you read andrastewhite's Camera Obscura (http://www.fanfiction.net/s/1856807/1/Camera_Obscura)? It's a missing scene from The Summoning, and what I'd call an ideal Londo/G'Kar hurt/comfort fic. There is no sex, true, and a good thing, too, because G'Kar has just been whipped and really wouldn't be in the mood, but there is emotional intimacy, and caring through snark, which fits the pairing best.
As for h/c in general: yes, dosage is key. Also, the comfort must be in balance to the hurt: what I mean is not that there must be equal of both, but that if someone is, say, raped, to use of of the trickiest and most popular fanfic clichés, I just don't believe an ending where this person is just fine and dandy after receiving comfort from character x. (Certainly not sexual comfort, but that's another issue. Let's say we're talking about strictly emotional comfort here.) I could, however, believe raped character y to have some hope in the future again depending on how her/his interaction with x is written and of course depending on what types of characters they are in general. Or say someone loses a child, either in canon or in the story. That's not going to go away ever. I'd be more inclined to believe a h/c story where the parent is beginning to deal with this kind of loss due to the help of character x than a story which tries to sell me on the healing being completely accomplished. Etc.
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As for h/c in general: yes, dosage is key. Also, the comfort must be in balance to the hurt: what I mean is not that there must be equal of both, but that if someone is, say, raped, to use of of the trickiest and most popular fanfic clichés, I just don't believe an ending where this person is just fine and dandy after receiving comfort from character x. (Certainly not sexual comfort, but that's another issue. Let's say we're talking about strictly emotional comfort here.) I could, however, believe raped character y to have some hope in the future again depending on how her/his interaction with x is written and of course depending on what types of characters they are in general. Or say someone loses a child, either in canon or in the story. That's not going to go away ever. I'd be more inclined to believe a h/c story where the parent is beginning to deal with this kind of loss due to the help of character x than a story which tries to sell me on the healing being completely accomplished. Etc.