Abdirak can be found in the goblin's camp if the said camp is friendly.
I have searched youtube for these particular banter but found only either Shadowheart romance or neutral ones, so I dug into my save files and made one myself xD
As far as I understand the trigger for this particular banter is to offer Astarion to feed on you while you sleep. Otherwise it is Shadowheart who comments the most in this scene.
Feel free to correct me, perhaps there are more conditions that I've overlooked.
![](https://i.ytimg.com/vi/aLVzAJqqoIg/maxresdefault.jpg)