In the context of that scene it makes total sense. It's not Ashe the one who's first encouraging them to kiss, it's Zoey. Thus, it's more something of "oh, this girl is asking them to do this, am I 'voyeur' enough to enjoy this type of thing and see how it goes?". It's a similar vibe that happens later on with Zoey and Fiona. Sure, you could interpret it as Ashe going 'dom mode' like you said and letting them do that, but in reality it's not like that. It's her taking a passive role and just watching, without any sort of initiative, which I think it's contrary to the Siren and even Kitten routes. It's different in the scene with Lexi and Fiona for example, where Ashe is an active participant of the act, and she's the one pushing the boundaries and actually controlling what unfolds. Plus, and this is a personal preference of mine, I've never been a fan of "I'm dom enough to make them do things while I watch." I hate being passive, I want Ashe in on all of the action. Maybe in the future, once Ashe feels confident enough and her intimate relationship with that family has deepened, then it would be a cool addition to push bit by bit Fiona, Delilah and Kate's boundaries. Not forcing it, just making them feel comfortable with her presence in that setting.