She wasn't planning on telling her about the former matter. She only wanted to educate a normal modern-day girl. She didn't wish for Zhenbei to develop a character of being able to have a lot of husbands. This was the modern world, and she could only have one mate.
As for the latter, Bai Qingqing would only tell her about it after she came of age. Right now, she was still young, and Bai Qingqing was afraid that the child might slip and spill it.
Bai Zhenbei didn't have the snake beastmen's legacy. She was just colder in character and temperature, being no different from ordinary human girls in other aspects.
"They're your uncles, so of course they'd come. Don't you like them?" Bai Qingqing asked.
Bai Zhenbei immediately fell into the trap, nodding with certainty. "I do."