will this fall on deaf ears yet again?

To you, I have said my piece. It is up to you whether you listen or you persist.

to the other you...

I never wanted to prejudge you or make any false assumptions about you. Simply because, I don't know you well enough. If your yearning for a relationship, an attachment is so strong such that it overwhelms your ability to see that she is simply a lost child right now, I feel sad for you.

你得到了她的身躯，你得到了她的心吗？

She is 17, you are 22. There is no excuse for you to claim you're none the wiser.

For all those things that you've did to her;

Let me pose you just one thing.

How would you feel as a brother, if you see a man doing those sorts of things to your very own younger sister?