A cup of coffee worth for a cup of tea?

Recently I was create a cup of tea, then my roommate ask me to make a cup of coffee for her. I created one for her and placed it to right of my cup of tea. It is two worth for subsitute?
I tried the coffee a slurp, it is sweety one, now looking on my tea. Put a block of sugar on it and slurp it, sweet, but different. I know, coffee offer very biter taste than a tea, and tea offer better aroma thats makes me “fly”.
Now I bring on 2 spoon, on my left it is coffee and in my right its the tea. Try it both almost in same time, wait…. the taste awful (what a stupid of me). Now I had to decide, I prefer coffee for today.
I walk to terrace and gave my roommate a cup of tea. She shout to me “Vina, this is a tea!”
“What’s different?” my answer.
“I want coffee.”
“I drank it”
“What?”
“Today your substitute is tea. Try it out!”
“No I can’t Vina!”
“Why not?”
“Cause this is my substitute day from tea to coffee.”
“Oh well….”
We have two similiar habits, similiar like and dislike, similiar hair color, and same substitute day. Well, her name is Cynthia.