1. Go Work at the her cafe 3 times ( once a day ) and pick the top dialogue everytime when she's having a chat with you
2. Go Work with her again and she'll ask if you would like to hang out with her ( Amelia Route ), so accept her invitation.
3. Make sure to go to the Gym first until you have Athlete Trait activated before you progress further with Amelia
4. Invite Amelia to your house on Monday to do morning run together, do this every Monday until she gives you blowjob
5. Go meet Amelia at the Beach on Friday and have sex with her and tell her you're falling in love with her.
6. Go Work at her cafe again and she wants to have sex during breaktime. The next time you go to Work from this point on you'll find Amelia Ending has been unlocked