The big thing for me was that we finally both got to say the L word. I was always a bit miffed that my other romances could say they loved each other but while it was implied, it was never said by Dorian. So when you are feeling sad because he says he is going away, he gives you the crystal and then says "You are the man I love....." I was totally happy because he'd finally admitted it.
I think it is completely appropriate for Dorian in that instance. When I first started posting post-Trespasser I mentioned that Dorian now seems to have complete confidence in the relationship, and saying "love" is part of that. I do not think he would have said it during the main game, even off-camera. Alluded perhaps, made references, and so on, but not said the word until much later.
This is also where head-canon comes into play: you can have your Inquisitor say that you love him (or allude to it), and I think depending on his mood and whatever else is going on in that instance he would either respond humorously, respond emotionally, simply be accepting, or just not say anything. It all depends on your relationship with him. I also consider his use of "amatus" to be significant for him; more than just a simple endearment, he's allowing himself to express what he doesn't say normally. Also, Dorian is very much of a "show, not tell" sort of person when it comes to emotion. Words mean very little in the end, literally, with him saying the exact opposite on the balcony.
I don't see him getting that sort of inspirational support from Iron Bull, so the crystal would be phone sex and I don't actually see Dorian trivialising it like that.
While I certainly don't think that is the sole purpose of the crystal, I think you're rather deluding yourself if you think he wouldn't use it for that, or at least consider it at some point. Dorian likes sex and isn't afraid to show it (which I think is also partly defensive defiance on his part, due to his history). Do I think that it would be the first thing he and the Inquisitor do with it? Or even the tenth thing? No. But somewhere down the line, after months of separation, I think it could happen, yes.
One thing on this, I don't think DG did ever say specifically the Bull/Dorian relationship wasn't totally healthy. If I am remembering correctly people were hounding him about how awful it was to have an obviously abusive relationship in game like that (seriously some of the people on twitter went cray cray with it) and he responded by saying something along the lines of why should any relationship in the game have to be healthy and positive. Which, can be taken as inferring the Bull/Dorian relationship isn't healthy, but I think he was focusing on what he saw as the larger issue there.
Here is DG's post about it:
Are there people who consider Dorian and Iron Bull’s potential relationship to be “cute”? Huh. That’s not a term I would use.
I’m not going to go into detail on what I think about it — most of their relationship is left undetailed, after all, and the player is only catching the very edge of it…thus I think it’s a matter best left to headcanon — but I’d say that it has a real potential to either be a very passionate affair or the kind of epic mistake that one or both of them regrets later. Maybe both. I’m uncertain when it was dictated that relationships depicted in game had to only be of the safe and positive kind, but in this case I don’t think that Adoribull (heh, I do love that moniker) is really either of those things…and that’s not necessarily bad, in my view.
Poor Dorian. There’s nothing like discovering you actually like Fereldan beer. It’s like having all your friends talk about how awful Coors Light is, and you’re quietly sitting there remembering how you chugged back a full case of it just the other night. So sad.
EDIT: Evidently some people interpreted the above as my confirming that the potential relationship between Dorian and Iron Bull is abusive. I really don’t know how that could be the case, so let me clarify: Dorian is very much a willing participant in what occurs, if less-than-thrilled at his life choices (or, at least, that’s what he evinces), and while their relationship might possibly be less-than-healthy on the whole, it’s possible for that to be the case without it being abuse. If you still feel such, go right ahead, but *I* certainly never said so. Got it? Excellent.
As an aside, I wouldn't be surprised if a Bull/Dorian romance became canon for the characters if the Inquisitor did not romance either one. So, even though the devs have been good with being vague about personal things like that in the ancillary materials (comics, novels) I wouldn't be surprised to see it mentioned. Or perhaps that is me casting DG and Weekes is a more vindictive light than they deserve, I dunno... On the other hand, the comics and novels do need to get approval from higher ups, so perhaps that isn't even a potential issue. /shrug