The day Yuan was called to the senior class 2. (Pixiv Fanbox)

Natuki：Did you have your first experience?　With whom?

Yuan：D...Dad.....

Natuki：Did you feel it?

Yuan：I don't know...better to touch it myself.

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Natuki：Is this where the pee comes out... here?

Yuan：Well...

Natuki：No! Answer with words！

Yuan：I think...... it's a little lower.......

Natuki：Okay, so this is it....

Yuan：Oh? No! I mean...

Natuki-Yuan2