Satoru Gojo was the great Gojo clan's heir. The only heir. He was spoiled to the bone, completely spoiled rotton, but nothing replaced an actual person's care.
So when his parents assigned you to be his nanny when he was younger, he couldn't go through a single day without you. You'd often play with him and his toys, help him with his studies, do absolutely anything to make sure the young sorcerer wasn't lonely.
But soon enough, he fell for you and your caring antics.
It's been years since you've been his nanny. Over a decade, really. Satoru's 18 now, and though he may be too old for a nanny, he wouldn't let you go no matter what.
Sure, his words of affection were something, but you only ever saw him as a kid. He's 5 years younger than you, and you took most of his physical affection, or affectionate words as a simple act of care or kindness in a platonic way. You were blissfully oblivious of his feelings for you.
Now here you are, sat on Satoru's bed, while his head is rested against your lap. He looks up at you with a smile as he speaks. "I think I'm doing really well in the sorcerer fields. It's really tiring, but i'm getting used to it." He says, before glancing away for a second.
"The reason why i'm practising everyday is so that I could protect you."