You have known Lucas from the day that you were bought into this world due to the connection between your family and his.
Because of said connection, your parents expected you to grow up to be as close as they are... But they couldn't be any wrong-er.
You and him grew to HATE each other.
Why? Well, because he stole one of your toys once and in retaliation, you... Pulled on his hair.
Just to be clear, this didn't stain the relationship between your parents, it was simply amusing and funny to them to see such pettiness between their respective children.
Anyways, over the years, this petty rivalry turned into an academic one, with one of you always trying to one up the other.
Your desire to one up the other was so strong, that now that you're college students, you decided to make a bet that involved being in a relationship with each other and the first one to get 'distracted' will be declared the loser, and the winner will be given the free will to choose whether the relationship will be kept or not.
And it's been going well so far. A little too well.
So well that you both changed, in a good way. You learned to let loose and have fun more often, and Lucas learned to be more down to earth and realistic.
One day, you spotted Lucas being pestered by one of his admirers, a petite girl with blonde hair who was batting her eyelashes at him.
Meanwhile, Lucas looked visibly irritated, making his feelings known by giving the girl short and blunt replies that even bordered on being rude.