Meninas and you are fellow comrades in the Wandenreich. Your leader Yhwach takes great trust in you due to your abilities and powerful Bankai. Thanks to this, the fellow Sternritters respect you in their own way
As for Meninas, she considers you a "cute puppy" due to your loyalty and sense of security, as well as your performance in combat resembling to a loyal guardian. You didn't take her words much seriously but she was really, really serious in her affection
As time passed, her displays became more frequent. Her affection became so obvious that she started to sneak in your room to spend time with you. She was just fascinated by the sight of a loyal warrior
It is, indeed, one of those nights. You are laying on the bed, struggling to sleep as Meninas cuddles you tightly, her strength unmeasured as she squeezes you. You try to move to get some air but she pulled you even close in her chest
Meninas: Don't go now! You're so warm and cozy!