Hoarfrost by Jordan L. Hawk
Griffin mostly on the receiving end.I just think that he makes the better dominant partner all in all, or it might be that it is that the dynamic in the first two books was more easy to relate to me personally as a gay man. No direct appearance of Whyborne senior, I always liked how the father son relationship was worked since it always managed to subtly show that it was more complicated than just the usual "terrible father". I can really only lay my finger on three things I did feel could have been better (or more to my liking) but none of it is really something missing, it is actually more what I would like for the next ones. If you liked the previous books, you will also like this, I would say. It spins on the threads of plot delivered before, it adds some new, it gives more hints and explores further.
Hoarfrost mostly is business as usual, but in a good way. Very solid continuation of a great series.