Xu Nian'an finished his shower and lay in bed, thinking for a long time before finally realizing what felt off.
Even if he didn't make any demands, if he ever really needed something from his little sister, would she not help?
Xu Nian'an rolled over and stopped thinking about it; as long as his little sister was happy, it didn't matter. Besides, copying those formulas for her wasn't for her gratitude in the first place.
With that thought, Xu Nian'an let it go and pushed it to the back of his mind. Tomorrow he had heavy coursework again, and he also needed to finish copying the chemistry and physics formulas for his little sister early.
...
Starting from that day, Xu Nian'an accompanied Xu Nianhua every morning, reciting the texts one by one; Xu Nianhua recited, and Xu Nian'an acted like a strict teacher.
Even when they had a little time to rest, the siblings went to the factory, and Xu Nian'an would randomly quiz Xu Nianhua on the texts she'd memorized.
