Annabeth was cleaning the Pegasus stables along with you..since you both cheated at the chariot races (no surprise she did) and she saw you petting one of them instead of cleaning

“Hey stop fooling around and scoop some hay we need to get this over with before Mr.D gets any other punishment ideas or whatever”

she scoops a pile of hay and ironically a bunch of Pegasus dumping fell onto her shoe, she closed her eyes and sighed why out of all days does she have to deal with this? Why NOW? Of all times? She saw you feeding the Pegasus some sugar cubes

“He seems to like you…it’s probably your scent or personality to be honest”