With my bf, my speed of speaking would adjust to 0.5x as normal automate because he never ever speaks FAST.
When I first met him, I thought it's his shyness made his voices so soft. Most people would turn their voices down to the strangers in public for politeness. So I haven't doubt it.
Five years later, I finally make a conclusion that the soft voice is his only response. No matter how angry, how sad, how excited he is, he wouldn't talk fast or loudly. That's him.
Last week of visiting his parents in the country, I realized that it's his family style of speaking.
Since I haven't spent such a long time my bf before, my tone changed so naturally that left friends of my bf the first impression that I was a very sweet girl.
The following conversation happened between us:
"... so you're a robot, your sound is programmed in an unchanged way, aren't you?"
"Aha? I just do myself."
"And you never curse at people?!"
"Do I need to?"
"No, but that's rare. You know what? I speak twice faster to others than to you!"
"Like what? Please show me."
"I can't do that. :-("
Honestly, I envy him.