He comes clean.

"Well... I have my what may be a magic notebook at home," Felix replied, rubbing the back of his head.

"Right, pull the other one," Krono laughed.

"I'm telling you, it's true," Felix replied. "It's called the Sex Note, and it apparently makes any sexual situation written in it come true, I wrote that Yang would go topless until we came to the beach, thinking it was just a joke, and I was shocked to see it actually happened. It could still have been a coincidence though, so I also wrote that she'd actively let her look at and touch her as we pleased, though I currently recommend doing not so much of it with Nia here..."

"Uh huh..." Krono said sceptically. "And just where did you find this thing?"

"...it dropped out of the sky after I fixed my tire," Felix admitted.

"Let me guess, it clobbered you on the head?" Krono laughed. He then saw Felix looking away and grumbling. "...it did, didn't it?"

"...yeah, it did," Felix replied, rubbing the spot subconsciously.

Kronos sniggered. "Ah man, that is exactly the kind of thing that could only happen to you..."

(Almost every character written to get the Note by Sexdream, and a few others: BULLSHIT!!!)

"What was that? I swear I heard something," Felix asked, looking around.

"Huh, me too," Krono added, also looking around. Seeing no potential source for the noise, they shrugged and wrote it off as their imagination. "...I'm not so sure I believe you though."

"I can prove it!" Felix asserted. "Assuming it is in fact real, and not a big coincidence of course. I still have a bit of scepticism myself... What's Nia's last name?"

"She doesn't have one," Krono told him. "She comes from one of those cultures that only has given names."

(That's one small difference in this world to ours, to accommodate the fact that some Waifus only have one name, it will be a not uncommon cultural thing.)

"Okay, makes sense. Just give me a sexual scenario between yourself and Nia tonight at your place, I'll write it in the Note when Yang and I get home, and you can text the result to me. Just say something you don't think Nia would do, at least just yet, and it should be a viable test."

Krono paused to consider this.