Afterward, Zhou Jiajia, Su Qingqing, and Xiaofang went together to find Lin Yifei to explain the recent incident and tell her not to overthink.

By then, Lin Yifei was hiding under the covers, not daring to think about what she had just seen.

However, the less she wanted to think about it, the more vividly she remembered; because it was like someone falling into a swamp, the more you struggle, the deeper you sink.

"Yi Fei, get up. Don't be shy. Your sisters-in-law have something to talk to you about," Zhou Jiajia called out.

Zhou Jiajia, Su Qingqing, and Xiaofang went straight into Lin Yifei's room, flipped the covers off, and pulled the hiding Lin Yifei out.

Lin Yifei's face was flushed red, the embarrassment still vivid on her face; she dared not face her elder sister-in-law for fear that the sinful images would invade her mind again.

Seeing Lin Yifei like this, obviously still misunderstanding, Zhou Jiajia had no choice but to patiently explain, "Yi Fei, what you saw just now wasn't what you pictured; your brother and I weren't doing 'that'. We were just fooling around."

"Fooling around? Big sister-in-law, you were in a thin nightgown, on top, and that was still just fooling around?"

Lin Yifei was utterly unconvinced by this explanation as if she were a three-year-old kid.

"If you don't believe me, you can ask Sister Xiaofang. She witnessed the entire process. Your brother and I were fully clothed. We really weren't doing 'that'," Zhou Jiajia answered.

"Is that so?" Lin Yifei looked at Xiaofang and inquired.

"Yes, your big sister-in-law is right," Xiaofang confirmed firmly.

Lin Yifei was skeptical and questioned, "Then why are you wearing sexy nightgowns to fool around? Could it be a test of love before marriage?"

"You could understand it that way," Zhou Jiajia responded.

Anyway, the more they talked about it, the more complicated it became. It was better to give Lin Yifei a reason she could easily understand, to help her clear up her doubts.

"Do all you adults like doing this?" Lin Yifei asked with palpable curiosity.

She wasn't young anymore and was approaching the age of marriage. She really wanted to know the answer.

"You'll know in the future. It's not convenient to reveal that for now."

Zhou Jiajia and the others felt that Xiaofang was still young and also still in college, so it wasn't suitable for her to be exposed to these topics too early.

"Alright then!"

Lin Yifei didn't want to press further because she didn't really want to know these embarrassing things.

However, one question had always lingered in her mind for over a decade, and now that her sisters-in-law were present, she wanted them to help her resolve this puzzlement.

So with a hesitant and embarrassed tone, she asked, "Sisters-in-law, where do babies come... come from?"

"They fall out from our bodies," Zhou Jiajia answered truthfully.

"Which part exactly do they fall out from?" Lin Yifei pressed on.

"Where do you think your period comes from?" Zhou Jiajia countered.

"Ah? They come from... there?"

Lin Yifei couldn't imagine it. This was somewhere she had never thought about. She assumed that place was only for periods.

"What else? And to think you're a top scholar from Yanjing University. How can you not know this basic knowledge?" Zhou Jiajia said incredulously.

"The college entrance exam didn't test it, and I studied liberal arts, so I didn't delve deeper into it," Lin Yifei meekly replied.

"Well, remember this, we women endure pain every month so that our future children can be born healthy and safely. Do you understand now?"

"I understand! I understand!"

Lin Yifei humbly accepted the lesson, considering it an important life class. She finally unraveled the mystery of periods' purpose—it was all for reproduction.

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