He lets go eventually. "I should be going. Best of luck on your journeys, Sadde."

"Yours as well, Jojo. Thanks for the hope."

He picks up his quarterstaff and heads onwards through the forest.

And she picks up her stuff and... tries to look for Somewhere to go. Maybe a city.

Further on in the direction she's going, the trees eventually thin out and she comes to the edge of a lake.

There's an abandoned cabin here. Also, the sun is setting.

How narratively convenient! She can spend the night there.

The cabin is surprisingly spacious. It contains several beds, a fireplace, and a small bookshelf.

The next day, in the morning light, she can see that the bookshelf contains one book with a white cover, and another with a black cover.

Huh. Okay. She picks one of them at random.

The black book describes the basics of dark magic.

If you are gripped by strong enough emotions - the example the book uses is lust, for some reason - you can channel those emotions into powerful magical effects. The book describes one such effect: the Arouse spell, which causes an enemy to be debilitated by sexual desire. Supposedly, a skilled mage can reduce a target to masturbating without heed for the world around them within seconds.

...sounds hot.

Any non-sex examples?

Examples are given of other spells, such as Blackflame and Might. There's also a mention of magical shapeshifting.

However, as soon as she reads the instructions on how to cast Arouse, the book crumbles to dust.

...hey! She was reading that!

She'll... read the other book and if it has magic too she won't read any instructions.

The white book describes the basics of light magic.

If you are not distracted by strong emotions, you can channel your raw willpower into powerful magical effects. This book describes effects such as Charge Weapon, Blind, and Whiteflame. There is a brief mention of magical healing.

It's a slim volume; there's not much else to read except the instructions for how to cast Blind.

...okay she'll read those.

They're fairly simple, but it makes sense that they'd be hard to focus on when desperately aroused. 

The book crumbles to dust when she's done.

Figures.

Anything else of value here?

Not really. The place was pretty thoroughly ransacked; it's not clear why the books were even still there.

(She's getting pretty hungry.)

...well, if she drinks from that bottle...

......fine. Not like she's unfamiliar with feeling like her body does not fit her.

The incubus draught tastes even better than it smelled. It's amazing.

As she drinks it, she can feel it spreading through her body and changing her. Her breasts shrink into her chest; her clit stretches and fills out until it hangs from her pelvis as a soft, uncut cock; her uterus folds in on itself and turns into a pair of balls, which externalize themselves in a sac formed from the material of her labia. It’s not painful; indeed, it carries with it a feeling of pleasure so intense it’s almost overwhelming.

There’s a cracked mirror in the cabin, if she’d like to take a look. 

She would, she would like to take a look.

She looks.

She tilts her head. This... this is fine actually. Huh. She doesn't feel dysphoric at all. At... all, really.

Actually.

She feels pretty great.

...he feels pretty great. Sure maybe she—he—is not a boy today but apparently not a girl either? Yeah. And he's... really hot actually. Like, really, really hot.

And having a dick is weird, it feels like it's moving in his underwear—wait it actually is in fact moving, it's—growing—he pulls it out—oh wow that's what a boner feels like, it's weird, a lot less wet—oh wow okay that's sensitive, he can touch it and his boner is super hard, he cups his balls with his left hand and slowly strokes himself, lightly caressing his length and rubbing his thumb along his tip, around the head, spreading drops of precum around it—

Sadde raises his right hand up to eye level and then puts his thumb and forefinger into his mouth, sucking on them and tasting his own precum—gods above he wishes he could suck himself, but he can't so he resumes masturbating. He grips himself harder, both hands around his shaft at the same time as he pumps himself and lets soft moans escape his lips. He starts moving his hips towards and away from his now-slick hands, the motion causing his trousers to fall all the way down to his ankles, and he shuts his eyes as a particularly loud groan rocks his body and flees his chest. Then he remembers the cracked mirror and starts watching himself—oh, okay, he can actually take his shirt off and then continue, watching himself, left hand feeling himself up, his abs and up to his nipple and he's close, he's so close, he's not even paying attention to the moans anymore, he just needs to come, needs to find that release, feel it as if it was the first time—

He comes, loudly and messily, shooting load after load in an arc up and towards the wall, dripping down to the floor and sticking to his cock and fingers.

Holy fuck.

He feels a little like he did after the incident with the plant. Not good, not bad, just - different. Like he's proud of something, maybe. He has a lot to be proud of, doesn't he?

Maybe. But Sadde's mostly spent right this second and, and that felt really different actually, less intense in a way but more concentrated in another? And he's still horny enough to lick his hands clean, grinning devilishly at himself in the mirror.

...but he should probably do the meditation thing. Yeah. Ugh, so much effort, though.

........he could do it naked. That'd be hot. And motivating enough. Yes, he'll do that.

Meditation makes it fade a little. Soon that sourceless pride is faint enough that he can barely feel it.

Okay. He's good. Kinda horny again, his boner is back up, but he thinks he wants to leave it up. He puts his clothes back on, adjusts his erection to the left side and makes sure it's noticeable, then it's time to go.

As soon as he exits the cabin, he feels like there's a right direction to be going in and a wrong direction to be going in, which is any direction other than the right direction.