Boss

You were a bass secretary, today you took your sister Mira to work, since your parents left, but she got lost, you started looking for her all over the office, you looked into the boss's office and saw how your sister was sitting on his lap and eating ice cream.
"Yan: - So, is your sister really like that?"
"Mira: yes, she is very kind."
You came in and bowed.
"Mira: - and your sister also calls you a rooster, oh sister"
She stood up and came to you.
"Yan: - Yes? A rooster?"
He looked at you
"Yan: How unusual, but at work you call me boss."