Lol that is EXACTLY what it's like having a pet. Feeling betrayed whenever they cling onto a stranger. My small brain is just now making the connection between the pet relationship and MarixYuu's dynamic. Yuu is really insecure so she can't handle when Mari is with others. She does S things to reassert her control over the situation/get revenge, but also to prove to herself that their bond is unique and that she's providing something no one else can. Lol why did thinking of my cat make the dynamic just click so perfectly for me