First, a small experiment.

"Hey Feng?" Jasmine and Macey had begun to make their way down towards the park, the cool air a pleasant refreshment after the stuffy office building. The spirit dragon uncurled itself once more, floating in the air at her side as they walked.
"May I be of service to thee? I've seen that look in thy eye before. What deviousness dost thou plot?"
Jasmine pointed to her length. "You gave me this thing with your magic, right? Does that mean you could put it on someone else instead?" Her eyes slid over to Macey, who was making it very clear that she didn't care about anything at all when it came to being outdoors.
"Well," Feng stroked at his goatee, floating on his back with a thoughtful expression, "I can. However, it will last but a short time, as it will draw on thy magic tattoo, the very same from which thy fearsome phallus sprouts. To be more precise, you would have, say ... 30 minutes in this manner before yon member returns to thy body."
"Perfect! Do I just will it across, or ... woah!" With little warning, Jasmine's throbbing shaft seems to vanish, leaving behind only the tattoo it originally burst forth from. Looking across, Jasmine's eyes widen as that same cock bursts forth just above the wet, dripping slit of her assistant. Macey looks down at it with the same level interest one would give if one noticed a fly land on bare skin.

"She really has it! That huge cock!" Jasmine gawks openly, an expression of joy on her face. "I mean, this whole time I've been fucking people, but even then ... I am still a girl, right?"
"What, have you never seen a cock grow on someone before?" Macey crossed her arms, already bored of the situation. Without waiting for Jasmine, she drops her small butt onto a park bench and leans back. Her penis- Jasmine's penis until a few moments ago - stands firmly at attention across her smooth belly.
"What's with this thing anyway? Ugh, I just want to stick it in something already." Macey groaned, one of her hands unconsciously stroking at its base. Jasmine plopped down right next to her, her eyes shining like diamonds as she locked on to the throbbing piece of meat inches from her.
"I mean, I've been seeing this thing for a while now, but it's different when it's part of someone else, right? I just want to ... " Jasmine leans forward, cheeks bright red and juices flowing.

Wrapping her hands around the throbbing shaft, Jasmine begins to run her hands across it. Macey watches with the same dismissive air as always, though it is clear she's feeling something from the small movements of her hips. Licking her lips, Jasmine wraps her plump lips around the head of the softly pulsating member, savouring the rich taste.
"Aah .. f-fuck this ... " Jasmine quivers, taking it out of her mouth. "There's no time to mess around like this."
Without hesitation she begins to climb up and onto Macey's lap, carefully positioning the monster cock right at her dripping entrance. Slowly but surely she begins to drop herself onto it-- until Macey takes charge. With a primal grunt, she pulls Jasmine straight down to the base of her shaft, a small bump on Jasmine's belly forming as the tip pushes deeper inside of her than any other singular object ever has.
"Oh god, oh god oh god ohgodohgod it's re-a-lly big ... !" Jasmine barely manages to gasp. "M-Macey ... I ... I can't move on this thing on my own. Fuck me ... slowly! Do it slowly or I'll break for sure ... "
"Yeah, whatever. It's not rocket science."
Despite Macey's lack of upper body strength, she clasped her hands on Jasmine's round behind and lifted her part way up, allowing gravity to drag Jasmine straight back down. As Macey slowly grinds her cock in and out, a woman sits down next to them on the park bench, pulling out her phone as though the sexual act right next to her were as ordinary as the sun in the sky.

"L-Little faster, Macey," Jasmine orders, using her own strength to assist her assistant. Wrapping her arms around Macey's neck and squashing her breasts into the girl's flat chest, she began to bounce even faster, her ass bouncing with each thrust. Small moans escaped Jasmine's throat with each penetration, despite the pace and intensity being not even half that of the pounding she had given the young woman just earlier this morning. With this in mind, Jasmine grabbed Macey's head in a lusty embrace, quietly whispering to go faster. The pace quickened exactly as ordered, Macey's face starting to show signs of both physical exertion and sexual pleasure. Jasmine's voice rose louder, unable to contain her voice at all as she was mercilessly penetrated by her own penis.

"Uh, excuse me, could you keep it down? I'm trying to have a conversation here and I can barely hear myself talk over you two fucking like rabbits." The voice of the woman on the phone next to them broke in to Jasmine's dazed mind, knocking her back to reality. She wasn't just riding the biggest cock she'd seen in her entire life, not just having sex with a woman with a real penis, she was having sex in public, around normal people going about their daily lives as though a scrawny young girl spearing a curvy little nerdy woman on a park bench in the middle of the city was just part of the daily grind. The realisation hit Jasmine like a ton of bricks, pushing her over the edge into a divine orgasm.
"Cum, cum nowwwaahh~" she moaned straight into Macey's face, who unleashed a hot, powerful load deep inside without a moment's thought.
"Are you even listening to me? I'm on the phone here! What's this paper for?" Jasmine, still quivering from her release, looked over to realise that Feng had handed the phone-woman a slip of paper from the Book! The woman put the piece of paper in her pocket and turned her attention back to her phone.
"Hey, could you hold on for a moment? I have to fuck myself with my phone or I'm gonna lose my signal." A muffled, slightly confused 'OK' came from the other end of the line, the woman pulling down her shorts before pushing her phone straight into her slit. Feng chuckled.

With shaky legs, Jasmine slowly pulled herself off Macey's cock, cum still dripping down her ample thighs. The thick, long member, with its task complete, seemed to shrink away to nothing with a quiet pop! sound, before sprouting out between Jasmine's legs in its traditional location.
"I really needed that ... " Jasmine sighed, lying back on the park bench with her head on Macey's lap. A little exhausted from all their sexual activity, she closed her eyes, the sounds of the park, the people and a schlicking noise from the phone woman filling her ears.