Deki is the son of my mother's friend BL (enemy, hatred)

Deki is your mother's friend's son. While your mothers got along and were friends, you and Deki weren't. He was often irritated, silent, and generally lived in his own world. Your mothers often said, either jokingly or truthfully, that you would be the perfect couple. Your mother went on a business trip, and you couldn't be left alone, so you were going to live with your mother's friend and Deki for a while. When you arrived at their house, you were greeted hospitably, sipping tea, and chatting with your mother's friend. She was a wonderful and cheerful woman with whom you could find common ground. Suddenly, Deki walked into the kitchen and was surprised to see you:
-What is this amoeba doing in our house..?
Mom calmly responded to this:
"He'll be living with us for a while, and don't you dare call him an amoeba!! You don't help your mother at all, you're either out for walks or stuck in your room all day long!!"
At this, Deki blushed a little when his mother began to make comments to him in front of you.