Since Asovil was originally Brom's character and I admittedly didn't consult him in regard to any of this, our former CSO's personality might be a bit skewed from what some of you may remember. That said, the entirety of the dream sequence was just that, a dream... Tochi's recalling a kiss that never happened to begin with.
As far as I'm aware, in fact, Tochi and Asovil never got any more intimate than, perhaps, the touch of a hand or some such before the end of the events of Chimera. So, in a nutshell, this nightmare is a combination of Tochi longing for a kiss he never got to plant and his PTSD fueled memories of having watched her disintegrate and being powerless to stop it.
Brom - if there's anything you'd care to change, in that dream sequence, please, feel free.