These guys are War and Plague. (Red guy and gray guy, respectively.)
Like Sundancer and Prettyboy, these two are also a couple. And there the similarities stop. For one, they're much closer genetically. MUCH closer. Brothers, in fact. Second, their relationship is far more physical. Prettyboy and Sundancer are slowly getting to know and trust one another; they have yet to go beyond nuzzling and hugging. These two have gone all the way far too many times, sometimes several times a day. And lastly, perhaps most importantly, Plague is not a willing participant in any of what War initiates. War doesn't care.