Ok. So Tav comes up to Astarion asking for a kiss, and then Astarion grabs Tav by the throat, Tav is scared, he feels uncomfortable. Would Tav go ask for a kiss a second time if he knows what awaits him? Okay, he'll go a couple more times, hoping that this time everything will be fine, but then he should definitely understand that there is nothing to catch. It is unlikely that he will want a continuation?
I mean that kisses with romantic interest are done in order to please the player, again and again launching pleasant kissing scenes. You, as I understand it, want to play a toxic relationship, where Tav is a victim, and this kiss will be played once or twice? It's just that those kisses that now exist, the corrected kisses, can well be considered both in a happy couple, and in a couple where Tav is afraid of the owner, and is forced to smile so that Astarion does not get angry. In my opinion, both sides were pleased.
Sorry, I really don't know why you need fear faces to use such a kiss once. As a player who plays in a toxic relationship in one of the playthroughs, I would not want to repeat such a kiss, over and over again, after such a kiss, where my character is scared, once is enough, and then Tav would break off the relationship. But for the sake of one kiss, bother and make a choice which kiss to get? Doubtful ... And I'm not writing for the sake of an argument, I'm just expressing my opinion.
I think that now kisses are ideal and perfectly suit both paths of relationship development.
If you really want to see fear on your character's face, you can ask Larian to do one such scene, without reference to these kisses, under certain conditions, but it's very difficult to do, I don't think it's possible now.
