He goes to the guild hall to check his options, and he's surprised by his pick (Bi route)

The first thought that immediately crossed Natsu's simple mind was the most obvious one. Not only was Lucy one of his closes friends, but now that he thought about it, she always wore very provocative clothes. Plus, with her magic keys, she could summon Gemini, which means he'd get to fuck 2 Lucys at the same time, and now that she had mastered the double summon, they could even have a foursome with Virgo. Sadly, as arousing as that thought was, it would have to wait, since he knew she was out of town for a job she took quite recently, and so was his second most obvious target, his childhood friend Lisanna, who had departed this morning with Elfman (which is why Natsu knew Mirajanne would be alone at home).

His mind briefly went to Erza, but he quickly rejected that thought. He didn't want to admit it, but even with the note in his hand, he was still as afraid by that woman as always, only now he was also attracted to her. He reassured himself thinking that's likely how most men feel about her, and hell, with the note he might be able to actually do something. He could even make those 2 feelings work together, maybe with some domination scenario... Okay, there was a lot to unpack there, so maybe leave it for another day.

His mind kept racing between all the beautiful women in the guild, of which there were no shortage, but that also worked against him since he found himself unable to pick. And even if he managed to pick someone right there, with his luck, she'll probably also be out of town. He figured it was better to just go there and see who was available.

He soon found himself in the Fairy Tail guild hall, subtly checking out all the scantly clad gorgeous women there, or at least as subtly as he knew how. With those around him, how the hell did it take a reality altering notebook to awaken his desires? Was he really that oblivious? Or was he simply asexual? Well, that didn't matter now, since his sexual desires were there, and demanded being taken care of.

Out of all the women there, Cana stood out to him the most, since she was just standing there drinking in basically underwear. However, when he was about to take out the note to start writing, a tap on his shoulder startled him. "Hey, Natsu, I've gotten a job for us." Said a familiar voice. When he turned around, he found Grey, shirtless as usual. However, this wasn't the same as it always has been, since time Natsu found himself staring as his friend's toned body "G-G-Grey? Where is your shirt?" He said while getting red in the face and trying to look away. Of course. The note had awakened his interest in sex, why would it be limited to just women? Thinking about it, it made sense the note would have made him bisexual, or maybe even pansexual.

"Hmm, you're right, I must have taken it off again. I have never seen you react like that, though, are you okay?" Grey responded. "You just startled me, that's all! Why did you come with a job out of nowhere anyway?" Said Natsu, trying but failing to compose himself. "Out of nowhere? I was shouting at you before, but you seemed really distracted today for some reason, And wasn't it you who said you wanted a job because you needed money?" Ah, that's right, he had said that. "Sorry, I kinda forgot. I've had a lot to think about lately. But tell me about the job. You said it was out of town, right? And since Lucy is on her own, I guess that means we'll be going alone..."

Author's note:

I've always hated when characters were completely uninterested in sex got an item like this and became expert perverts in seconds, without at least describing how the item corrupts who touches it or something like that. But Sexdream has gone one step beyond, and I really liked how he incorporated it in a natural and (for me at least) believable manner. Finally having Natsu lusting for others like that has inspired me to finally create my first branch on a story, hopefully the first of many.

I've taken the liberty of doing a small retcon on the previous chapters. As you can see, Lisanna is out in a job, while in Sexdream's story has been mentioned that she was still missing. I didn't like that since that would anchor me (and you, if you want to write your own branch) to pre-Edoras stuff and characters (so no Gemini for Lucy either... yeah I like it better this way).

Also, I feel I need to mention English is not my first language. I'm by no means a rookie, but sometimes a mistake might slip, be it grammatical, spelling, or simply some phrase or word that doesn't mean what I think it means (unconceivable!). Whatever it is, please don't hesitate to let me know.