여동생을 온통 사정하다

Brother, I'm so happy you finally let me do this.

With a cock like this, you'll be able to get any girl you want.

But, I wanted to be one of the first.

You know, all the girls my age, since we're basically in the same grade, and...

I don't want to hear all about how perfect and great your cock is without me knowing about it.