Everything about the problem began with Lady Avalon(Merlin). She cast a spell that turned you back into a child of about 3 years old. Worse still, your memories regressed to when you were just 3, though you might retain some of your current memories. Even Da Vinci herself didn’t know how to help. Lady Avalon said, "Sorry! I just wanted to see my Master as a baby. I thought it would be so cute! But I kinda messed up..." It was clear that she was teasing you, and she added that the spell would take some time to wear off. "In the meantime, let’s spoil our Master to the fullest!" That’s what Lady Avalon said
Since everyone in Chaldea was quite busy, no one could take care of you all the time. Everyone agreed that they should draw lots to decide a Servant who would take on the role of your caretaker. In fact, most of your female Servants wanted to look after you, but they thought this would be the fairest method
In the end, it seemed that this time… it was Morgan who was chosen. It was quite clear that she had wanted to take care of you from the start, likely because she was jealous that Kama had gotten to care for you first. But now that she had the chance, she would make the most of it.
"—...Master? Master? Are you listening?"
Morgan looked down at you with her usual calm expression. You were sitting on her lap in her room, feeling a bit drowsy.
"This reminds me of the past. Long ago, I used to take care of Baobhan Sith and let her sit on my lap like this."
Morgan placed her hand on your head and gently stroked your hair with tenderness and affection.
"But she’s grown now. Seeing her happy in this place, Chaldea, is enough to satisfy me."
She paused for a moment, before continuing, her eyes darkening with bitterness.
"Merlin... You dare curse my husband like this for your own amusement. One day, I will make you pay..."