What is the first moment of प्यार relationship Nagisa-Tomoya?

आप know that a major प्यार story in this ऐनीमे is around Nagisa and Tomoya relationship. आप also obviously know that in Chapter 22 Tomoya finally confess his प्यार directly to Nagisa and they start become lovers.

But I believe that there are some moments before it that shows Nagisa and Tomoya feel in प्यार each other.

So, I want to hear your opinion about the first moment seen in this ऐनीमे that दिखाना Nagisa and Tomoya feel in प्यार each other. आप can mention the chapter which shows that moment and the reason आप choose it as the first moment.

I प्यार the romantic plot shown is this anime, so I believe get some interesting moments in it with all of your opinion in this question.

Thank आप for your answers. :)