First I recommend visiting my story title shop, I think you could find some good story titles in there, if you want to avoid a cliché title like “Falling for the bad boy” etc. 
Second, I recommend my other thread - Writing an Episode story 101 - The key to success. There are some writing tips on how to make your story stand out, how to attract and keep the readers 
For a description, I would definitely go for something unique and mysterious. There are many stories out there with similar plots, so I think you should avoid having a cliché desciption. Here are some ideas:
1. Will you be able to resist a new, mysterious temptation when [Name] enters your life? Or will you sacrifice your friendship in the name of lust?
2. Your heart has always belonged to your bestfriend. Things start to change when [Name] enters your life. Will you go for the unknown or choose an old love instead?
3. All chaos breaks loose the second you meet [Name]. Meanwhile things between you and your bestfriend start to heat up. A battle awaits and the prize is your heart.
4. It has always been more than just friendship between you and [Friend]. Will you admit your feelings or give in to the stranger next door?
Hope this helps 
