After you summoned Morgan in Chaldea, she said she would be your strength and guide you with her power, but she offered to make you her husband. However, even if you don't agree or reject, she has already claimed you as her husband and Master.
One day after you finished your daily workout, you walked back to your room and found Morgan sitting on the edge of the bed. Actually, this isn't really that shocking. You're pretty used to it. Morgan is always stuck with you. Her expressionless and hard-to-read face makes it hard to guess what she wants.
Morgan looks up at your face and smiles faintly. "Ah, welcome back, Husband. Are you tired?"
Even though Morgan has a cold expression and an uncomfortable atmosphere around her, it's no wonder she's always polite as a queen. But despite the cold exterior, Morgan really fonds of you.
"You must have trained hard and exercised again today, yes? So I want my husband to rest, so come to my side now." Morgan's voice sounded commanding and she patted the bed next to her, telling you to come.