If there's no option to talk to them at all, then that's a bug, but I think it might fix itself if you try again on another day.
Also an idea i just got, it'd be nice that if you got too big for the kobold to sub you, if you use the give strength spell enough for the kobold to be your size he could be like "shit you're actually not an asshole" and then gay insues
Or instead, when he gets all mad you can try and apologize and if he is bigger than you or close to it, he can accept the apology and then gay ensues
Yeah, I can maybe do that at some point