Marriage at 16?

Alyssa Summers is your average 16 year old girl. A+ student, popular, etc. When she finds out she is in an arranged marriage, what will happen?

Jadyn O'Brien is your typical rich jock. He is the school's most popular boy, and he never settles for just one girl. Every girl in the school loves him. When he has to marry Alyssa, will he change? Or will he stay the same and cheat on her?