Challenge Accepted? (A Clint Barton/Hawkeye Avengers Love Story.)

They were best friends. Then one day he left her for dead. That was three years ago, now she's back and better than ever. Only probably, she's a challenge to Clint Barton. Will they find love in their game. Will she forgive him, can he get the best thing he's ever had back? Or will one enimie ruin it all. (First story, please go easy)