As the Hermes cabin snickered and it finally turned dawn, there prank was just beginning.
They were pranking Percy and AnnaBeth by (some sorta magic idk help from Hecate kids) switching out there genders, as in Percy in AnnaBeths body, and AnnaBeth in percys body.

Percy awoke rubbing his eyes "Tyson" He muttered, he heard snickers, as he sat up and looked down.
"Oh... My... God's" He just stood there not knowing what to do, "I'm a girl!" All the other Athena kids knew about the prank so they played along. "Um AnnaBeth what are you talking about?" Percy walked to the mirror and was astonished "I HAVE BOOBS!"

AnnaBeth woke up early standing up stretching, she realized there was no one in the cabin... Beside the sleeping cyclops. "Oh no" She walked to the mirror seeing she was her boyfriend.
She chuckled and walked to the Athena cabin.
She opened the door to see Percy/her checking himself out in the mirror. She stood her mouth ajar.

Later in the big house

"EVERYONE PLEASE CALM DOWN!" Chiron shouted over the kids, there was a silence
  "It was obviously the Hermès cabin!" An area kid yelled, a few mutters of agreement
 
   "Chiron please fix us" anabeth said annoyed. She looked over at Percy who was still in shock.

"Were working on it" Dionysus said annoyed