I'm not sure I agree. Amy (284) has an "ohmygod" reaction, followed in 285 with what looks like her Pink Clouds programming breaking down. It's later in 285 that the aphrodisiac effect kicks in. Neither Kanti nor Laura comments on the odor.
Amy comments on the smell. Her "ohmygod" reaction doesn't look sexual and appears to be the revelation. Then she slowly realizes she's horny.
Hayley comments on the smell. As far as we know she has no revelation to experience. She realizes she's horny more quickly, possibly because she's already seen that that happens.
Kanti and Laura already know it's going to smell and that it's going to make them horny.
Possibly Kanti's failure to remark upon the smell is due to her familiarity with it - it appears to smell similar to Pink Clouds. Perhaps that's why Miriam doesn't remark on it too. From what we see, Laura is more of a passive inhaler of the stuff.
Like I said, the timing between panels is always open to question. Miriam's "Oh" panel could be a revelation. But I'd have thought she'd have something to say about it if it is. If she has no revelation to come to (and arguably she ought to have) then it would seem the use of the antidote is pointless here. And personally I'd have bought that Erin could work her magic without it because, you know, it's magic isn't it? (I have this notion that Miriam is the anti-Adrian. Perhaps Pink Clouds is the antidote for her?)
It occurs to me that Kanti's "Ok, so, we should talk about this" to Q in 294 could be her response to the antidote. She knows that Q used Pink Clouds on her, but perhaps she isn't that pissed off by what he did. So Q gets a 'we need to talk' instead of a bitch-slap.
I can buy that, although we've twice seen her seek reassurance that Q hadn't used it on her, and indeed she gave that as her reason for taking the antidote. But there is a suggestion that that is merely a pretext for trying an aphrodisiac. We don't know the state of their relationship prior to Q using Pink Clouds on her but it appeared that she would have considered it a bad thing if Adrian had been using it on Laura. Indeed the whole point of the antidote is to provide protection against its use.
As with most things the context of the "we should talk about this" remark is ambiguous. For all we know Q just suggested they should get married. Or perhaps they were just discussing Q's past involvement with Pink Clouds. Or his ability to whisk up apparently safe aphrodisiacs that could provide a very healthy income. Or how it frightens her that she likes them so much. Or perhaps they were discussing where their plan for Kanti to get into the SJI and find Adrian's stash of Pink Clouds stands now. Or perhaps he just admitted that he knows how Vik came up with #49 in the first place and he's sorry about how all that got a little out of hand, what with her brother having just used it to abduct a woman and all, but, yeah, let's have drug-fuelled sex first and then we'll go and have stern words with him. Or it could be something else entirely.
Perhaps she enjoyed the role play aspect.
I think that - or something like that - is what's being hinted at. But the key thing is that if the antidote isn't actually an antidote, then she's still under the influence of Pink Clouds here.
I should say I don't have this as some rigid theory that I'm clinging to - I'm playing devil's advocate to some extent. But there are a lot of coincidences in this sudden reappearance of Pink Clouds. It would make more sense if there had been a degree of collusion between Q and Vik. And we already know that both are liars. And something's going on in Erin's head right now - and there's just an outside chance that it could be something to do with this. Although if I'm honest, I doubt it.
I want to call out for a moment what high praise this is for PK's art... he's able to distinguish alarm and surprise in just someone's eye.
And I'll endorse that by reiterating that I love the last panel.