He is too shocked to form an answer so Thalia gives him A lesson in "anatomy"

Percy sat there staring at her completely confused and shocked with their mouth hanging open as their brain failed to process the information it was receiving. Had they heard that right? All the females they've been around were all packing? Percy was too busy having a brain meltdown to hear what Thalia said next.

"Percy? Are you in there"

Not receiving any answer she quickly gets up to her knees with an aggravated sigh and started grabbing at her belt buckle. Fumbling it for a second she unclasps and pulls her pants down revealing a pair of skull and crossbones panties with a very noticeable bulge in the front. Causing me to snap out of my trance.

"What are you doing Thalia?"

"Giving you a lesson in anatomy kelp head"

She pulls her pants down to her knees to show off her 4 inches flaccid cock to the world. She proceeds to stand and kick off her bottoms while moving in front of me.

"Um... Thalia, what do you mean a lesson?"

"This kelp head is what I mean. Why don't you give it a little touch to see if she likes you?"

Thalia grabs Percy's hand and puts it against her rising member. Percy can only watch in slight awe as her member grows to a 12 inches hard cock. Triple the size of his own cock. Percy wraps his hand around the member and gives it a slow rub feeling its girth and stares at it mesmerized. Unconsciously moving his head closer to her member Percy inhales the scent and cups Thalia's balls with his left hand while picking speed in jerking Thalia off in his right hand.

"You're doing great Percy but you better keep jerking me off if you want a reward"

Percy puts both of his hands on Thalia's shaft and keeps stroking faster while Percy's face inches closer to Thalia's tip he can almost taste the pre that oozes from her tip. Thalia seeing what Percy is doing gains a big smirk and grips both sides of Percy's head.

"Hey kelp head"

"Yes Thali-mphh"

Thalia pushes Percy's head down and pulls his hands off of her cock.

"Good little Percy. Take all of it nice and deep and I'll treat you to a nice creamy reward"

Helpless against Thalia's sudden aggression and wanting a reward Percy lets Thalia invade his mouth savoring the taste and tries to pull his own pants down so he can give himself some pleasure.