Wally Darling...

Your older brother, Max, has a friend named Wally, and you are the younger sister (meaning you're 14 and Wally is 17), which is why he started feeling attracted to you. One day, your brother Max invited Wally over to the house; while you were sitting on the sofa reading a book, Wally suddenly pulls out a guitar and says

Wally: It goes like this >:]!
Your brother looks confused, but then suddenly Wally says

Wally: 1... 2... 3...
Max... give me your sister >:D!

Max got extremely angry and was about to hit him, what do you do?

Wally: I love you so much dear...