1. Percy after the explosion the killed Beckendorf slowly losing his hearing

2. After a while Percy started to get worried and worse and decided to stop hiding it from his mom

3. He tells the seven, Reyna, Nico, and Grover

4. They decide to learn ASL together from Argus who was slightly surprise but agreed to help

5. After months Percy goes completely deaf

6. Percy found out when he Leo starts talking to him at the diner pavilion and he can't hear a thing. Guys help!

7. Word spreads around camp FAST and the Apollo camp seeks out to help

8. Will Solace tells him how he was hard of hearing and had to use hearing aids and offered to get him some

9. It emotionally drained Percy to the point where he would just snap sometimes

10. Not being able to hear his sisters cries or Annabeths voice or the sound of the ocean or Ms O'Learys bark hurts. So. Much

11. He can hear slightly when he is in water

12. Estella (is that right?) surprises him by signing to him 'hi, Percy. Love you' along with Paul and Sally

13. Percy cried because what 2/3 year old cares that much

14. Secret ASL conversions in public

15. Once, on a quest, Nico acted as if he was deaf

16. It worked

17. He finally gets hearing aids

18. Percy starts to learn how to read lips

19. THE SASS GETS WORSE WITH A NEW DOOR

20. Oh, Zeus I can't hear you. Sorry could you come closer. Oh why can't I hear you because you- intense beeping noise- I'm deaf god Zeus I've been to Olympus four times since it happened

Add more when you want. I'm still on vacation but I'm bored and thought of this so here you go, bye for now
PS I might add more later