The Black Dragon's body shrank, morphing into a half-dragon humanoid form, and donned a Black Robe and Face Armor woven from Dark Power, standing behind the Dark Knight.
The body continued to shrink, revealing a slender figure that indicated she was a female.
As for Dark Knight Austin, facing the adoration of the elf maidens, he neither rejected nor responded, not out of lechery, but because he was new and concealing his identity, he had to establish a distinctive persona.
Austin had not fully awakened, and his power was insufficient. He knew he was no match for the Naturalist, Sun, and Moonlight God-chosen Knights, so he dreaded the possibility of losing his life to them and hence had never dared set foot on the Icebound Continent.
Now that he was here, it was essential to establish a solid persona, revealing his weaknesses to those with an eye for them.
Having weaknesses implies desires, and those with desires are easier to manipulate and target - this held true everywhere.