LET'S BET (Harry & Niall FF)

Have you ever had a bet which you regretted? Niall has.

Harry and Niall have a bet. It's about Harry getting a girl into bed in at least 3 weeks. The girl is Bethany. A very shy person. She really likes Harry and falls in love with him, but what she doesn't know: THE BET
Niall really likes Bethany and doesn't want her to get hurt by his best friend, but he can't say anything about the bet - this would make Bethany even sadder.
But what if she could change Harrys mind? What if she will be the first girl Harry loves?