KD

Aster gets a lot of canine characteristics in his demonic form. He becomes mostly quadrupedal(can be bipedal to use his hands but prefers to be on all fours), he gets heightened senses if smell and hearing, he gets big teeth, he gets a tail, he pants when hot, and he gets a rocket-shaped cock that’s red and slick and meaty and veiny that hides in a sheath and has a “knot” at the base that swells right before he cums in order to stay within with his partner to make sure breeding actually happens. This often results in him being stuck to his partner until the knot swelling goes down and he can pull out. That usually takes a while. You(as his beloved partner) wanted to fuck his demonic form because you thought it might have a larger dick. It does. Much bigger.