Do S na Pet 1

This is the worst...
Riko, who lives alone, has been forced to live with her uncle Rikuto at her parents' suggestion. He was once a handsome, egotistical man she admired, but now he's kneeling in front of her with his pants on his head...
His behavior is awful, but his appearance is to her liking, so he passes. When she tries to get rid of him, he suggests, "Just keep him, even if you treat him like a pet.