No, He's interested in satiating a different kind of hunger... (Incubus Route)

Clicking his mandibles, he releases the dazed woman. If this hunger so easily takes him over, then he thinks he should change how it's expressed.

SNAP

The sound echoes through the surprisingly clean sewers, and immediately he can feel it; some inexplicable change in his eldritch physiology.

Now, he feeds on sexual satisfaction.

His form shifts and creaks as it rapidly settles on an infamous shape; an incubus. Deep purple skin, golden eyes, twisting ebony horns, and a spear-tipped tail capable of enthralling anything it punctures.

Not to forget his new endowment, a large tentacle cock, testicles the size of his fists, and the certainty that he'd be irresistible to his victim.

Thinking up a story quickly, thanks to the increased intelligence of his body, he apologizes.

"Ahh, my apologies for the scare. I simply wanted a touch of... privacy." He smiles, sending shivers down the traumatized woman's spine. "You see, I have an offer for you, and since I'm not one for speeches, I'll be blunt; how'd you like to be a succubus?"

"W-what? Like you?" Quick on the uptake despite her clear shock, she asks for an explanation.

"Not quite, I'm afraid. You see, I want you to be mine, my lover, my food source, as my kind feeds on lust and love." He shifts, waving his tail in entrancing swirls. "If you became a succubus, I'd have a food source for much, much longer. Unless immortality doesn't interest you?"

Not willing to actually give her the chance to deny him, he clicks his fingers again.

SNAP

The woman would now rapidly become infatuated with him, eventually being completely willing to do whatever he asks of her.

"No! I-I mean yes, I'd love to!" She shouts, shivering from arousal.

"Oh? You're certain? There's no going back on this, you'd be mine," he leans just past her shoulder, whispering. "forever."

"Please, I'll do anything!" She whimpers.

"Now, now." He chuckles, leaning back. "There's no need for that, I offered, after all. I will demand one thing from you though!" He says authoritatively. "Absolute loyalty. If you cheat on me, I'll abandon you completely."

"I'll never betray you, I swear!" She nods. "Promise?" I ask. "I promise! Please, change me!" She says, reaching out to him.

"Very well, prepare yourself. The change will be the most excruciatingly pleasurable experience you'll ever have." He says, quickly piercing her heart with his tail's barb.

A gasp escapes her lungs as the most potent aphrodisiac in the known universe is pumped directly into her heart at a rate and dosage that'd be lethal with any other fluid.

The change is immediately visible, her body sculpting itself into an icon of the sin of lust, her skin rapidly reddening, her irises changing to yellow, a heart-shaped tip, sprouting from her tailbone before shooting out into a quickly lengthening tail.

Her figure improved too, subjectively. Her rather large tits shrinking till they were AA-cups, her ass not necessarily growing, but rounding out, her thighs becoming plump and juicy, and her hips widening just enough to draw to the eye. All the eyes.

Her transformation complete, she lays her lustful gaze upon him. Panting, she smiles. "Thank you for this gift... Master of my heart."

"It was my pleasure. Come, let us celebrate your new lease on life by creating more of it." He smirks.

Together, they leave the sewer and rapidly make their way to her home, with her guidance.