After The Last Olympian except everything to do with Artemis is replaced with Hestia

Sally POV

I was minding my own business, cooking some lunch, when suddenly, behind me, a pair of bright blue and pink flashes happened and when I turned around, Poseidon and Aphrodite were there, and Percy, who had peeked his head outside of his room, widened his eyes and stepped out. "Poseidon…Lady Aphrodite."

"Dad? Aphrodite? What are you doing here?" he asked.

"Percy! Be polite!" I snapped at him, "Sorry, he's in a kind of mood right now because his-"

"It's OK, we're just here because Aphrodite wanted to give you and Percy a gift since he turned down immortality and you bore him." Poseidon said.

"I, uh, OK."

"So, what my gift will do is allow you and Percy both, as well as one other person of his choice to change and see every aspect of themselves and everyone else (including gods and monsters) at will, including skin color, hair color, height, body shape and size, even more mental things like fine motor movements and intelligence, to a limited degree."

"Silver."

"What?"

"Silver, my next-door-neighbor. Athena's daughter. I choose her to receive the gift."

"OK. I see her, she's studying. OK, this might hurt a bit."

"Wait, give me a second." Percy fished out his phone and sent a text. "OK, I'm ready."

"Aphrodite chanted in Ancient Greek, then blasted us with pink light, one going out the window to Silver's house."

PERCY POV

I woke up next to my mom a couple minutes later, and tested out my new abilities. I made my hair change from raven back to red to blonde to blue and back, and took off my pants and grew my dick from 8 inches to 10, 14, 24, all the way to the point where it was 3 feet long and pretty heavy. I put it back to my normal length, and saw that my mom was doing the same thing. Her breasts shrunk to an A0 to a DDDD-72 or whatever the heck it was, then back to her normal size. "Go, I won't keep you away from your girlfriend any longer."

I bolted out the door, almost forgetting to lock it, and knocked on Silver's house's door.

"Who is-Oh! Come in, Percy, Silver's in her room." I walked in and went into Silver's room, where she looked up, her face brightened, and she ran over and hugged me. Silver's dad walked away, hiding a smile, and I closed and locked the door.

"So, what are you here for?"

"Actually, I have something to tell you. So, you probably were out cold for a few minutes, right?"

"Yeah, I was wondering what that was, lucky my dad had just passed by earlier and not then."

"So, basically, my dad and Aphrodite came and decided to give me and my mom a gift. I asked if you could also get it, and they said yes."

"What gift?"

"Well, so basically we can change and see everything about us and everyone else, including gods, like physical things and mental things. So I can make my dick 3 feet long and you can make your tits 1 foot thick, and we can both make ourselves smarter and taller."

"OK. We need to be careful with this. If anyone finds out about this, we're dead. So, if you want to make yourself smarter, you can do it. I have an IQ of 190 and yours is 150, so if we both make ours 25 higher, than mine is 215 and yours is 175, making me a almost as smart as Einstein and you an average genius. The growth and strength is more complicated. We have to look at our growth patterns and complement them slightly, but enough that the trend makes sense and we end up at a respectable height – like 6'5'' for you and 6'1'' for me, that's on the higher end of the spectrum for men and women. Strength, that's easier, just a bit every day."

"Wait, what?" She repeated everything she said, but slowly.

"Now show me what you can do with the cock of yours." We both stripped and sat down on her bed. I took a good long look at her and jerked off for a little bit until I was fully erect and oozing precum.

"So, this is me normally erect, right? Pretty big."

"Yeah."

"Watch this." I slowly grew my cock from 8 inches to a foot, two feet, three feet, then stopped. "I haven't gone any farther than this or experimented yet, so…"

"Keep going, I want to see how far it can go." I grew it until it was 4 feet, then 5, 6, 7 – at which point it was really getting annoying, then Silver said, "Stop. Do just the length and just the girth as well." I shrunk it back to my normal size then made the girth from 7 inches to 10, and the length to a foot, where it was as thick as my leg, then put it back to normal and then shrunk it until it was only about half an inch, when I couldn't shrink it anymore. I told her so, and she said, "Interesting. So it seems to be bound only by physical possibility, such as blood vessels and muscle mass." Noticing the bewildered look on my face, she said, "Meaning that everything that's supposed to be there has to be there. So probably, like your dick size, there would be no upper limit to my tits, but it can't be smaller than my chest, right?"

"Ohhh yeah, that makes sense."

"OK, my turn." She moved next to me, then her boobs started to shrink from C-cups to B and A-cups, until her chest was just flat, then after it stopped, they started to swell. The went to D-cups, but after going to DD-cups, instead of going to F and G-cups, the actual size started to go up – DD-32, DD-36, DD-44, DD-50, DD-58, DD-72, DD-90, and when they were so big that they looked as big as her entire torso and I was sure it would stop, nothing happened, and when the size was what I thought was DD-500 (at this point, they took up most of the bed), Silver stopped it, and engulfed me in what I think was a hug (it was hard to tell because of the size of her tits), but fell backward from the weight of her boobs, pulling me with her. As I fell on top of them, they bounced similarly to a trampoline, and they lay there together for a few seconds before he asked her to shrink them to her normal size, like he did.

"I also want to try something else, watch this."

"OK, what are you going to do?"

"You'll see." She pulled herself to the other side of the bed, then spread her legs into an eagle position. For a second, I thought she wanted me to fuck her, and made a move, but suddenly, the skin around her cunt and asshole were clear and I could see the size of her pussy, her asshole, I could see her blood vessels, her- "Percy. Percy! Percy!" My head snapped up.

"What?"

"Are you listening?" she asked, looking a bit annoyed.

"Sorry, was just thinking."

"Well, that's new. As I was saying, The invisible skin must come from the skin color, and I think we might be able to change the color of bodily fluids, like blood and urine, and also inner parts of our body, like our heart."

"OK."

"So anyway, watch this." I looked at her cunt and something that would change our sex forever was happening. I could visibly see her cunt shrinking until it looked like even a pencil wouldn't fit inside, then widen up until my entire arm, up to my elbow, could fit inside. She shrunk it back to her normal virgin size, and the skin around it rippled back to normal.

"Try turning invisible," I said. Immediately, her skin began to ripple until her skin was completely gone. However, I could still see her bones and organs, and just as I was about to point that out, her bones disappeared, then her blood, then everything.

"Now you try." I had some trouble grasping the concept though, so she said, "Try visualizing the intended result, that's what I did." Instead of only turning my skin invisible, however, I turned everything inside me invisible, increased my sex knowledge and skill tenfold, and made my dick nine inches instead of eight. "Nice! I can't see you anymore."

We both turned back to normal, by consensus, and I noticed that Silver had also made some slight changes to her body. The hair she had wanted to grow out for so long now went down to her stomach, her boobs were now size DD-36, her ass looked a lot rounder and jigglier, and I could tell that her pussy would be a lot tighter than before as well as all traces of bodily hair were gone. I also felt a growing urge to hold her and fuck her until I couldn't move anymore, when she said, "I think it also made it so in general, we have love magic, like Aphrodite's scarf from the Tunnel Ride of Love."

"So, like it makes people like us?"

"Basically. It makes people like us, and with people that already like us, it becomes sexual attraction. For example, I'm a lot hornier than I usually am around you, and it's taking a lot of effort to not sit on your cock right now."

"Same, I really just want to bury myself in your ass."

"Well, then," she whispered sultrily, leaning towards me, "Take. Me." She sealed the deal with a kiss. Those two words were too much for my concentration and self-control, and my horny teenager self took over.

Once again, this is from a couple months ago (like 4 or 5)