Help me find this rofan childcare story

I honestly don't know the plot of the story. The only thing I know) remember about it is an edit I saw once on YouTube. I searched for the edit but couldn't find it sooo.....

Anyway, the edit was a scene where the fl(a child) caught her brother with her teacher (tutor?) Kissing on the balcony.


The fl and her brother have black hair and I think golden eyes. The teacher, she has a long wavy blue hair.

That's all I could remember but I really wanna know the title so please help me find this