Laugh at your sister and offer to give Trish a lift to the concert with you.

That settles it. You decide to get one up on your sister and, right in front of her, ask Trish if she needs a ride to the concert.

She shyly says, "Yes."

You offer to take her home afterwards. She great fully accepts as otherwise she would have had to catch a cab.

As you go to leave your sister offers you the hundred dollars again and you turn her down. She storms off saying that you will never get anywhere with Trish.

Driving to the concert gives you a chance to check Trish out a little better. She's dressed in a low cut red shirt that gives you an excellent view down the cleavage of her b-cup breasts. As she gets out of the car, you check out her tight arse in a knee-length skirt with no visible panty line.

You find your seat and can't believe your luck as sitting next to you is a very pretty girl about eighteen years old. She's dressed in a tight silver singlet that shows off her fantastic d-cup tits and also very tight leather pants. As the concert is about to begin Trish makes the comment that she has to get to her seat, but does not want to sit by herself.

You must think of a who you would rather watch the concert with quickly as the lights are beginning to fade.