Mark only respects people who he "loves".
He never loves anyone, just likes sexual encounters and being adored.
Only one person held that spot, YanYandere is one. He respects her, doesn't push himself on her and respects her personal space.
Now it seems he has fancy a little male fuu dog.
Too bad Mark doesn't know what's under that fluffy face, hehehe, I hope he likes being the sub.