Oh, yes

Emily immediately got down on her knees and began sucking, but she immediately struggled to fit James' cock inside her throat.

She released it as she gasped for air, coughing heavily, but she proved undeterred as she continued to try and fit her brother's (or maybe sister's) massive schlong inside her throat.

Dissatisfied with Emily's pathetic attempts at cocksucking, James grabbed her head and forcibly shoved it down, making her gag and **** on her cock to her sadistic satisfaction.

"Oh fuck, yes," James moaned, "God, your lips feel so damn good; you'd make a great onahole, you know that?"

Unable to speak with a cock lodged in her throat, muffled gasps and screams were Emily's only coherent answer.

Like a ravenous animal, James rammed her cock hard and deep into Emily's mouth and her sister's screams only increased in intensity, the poor ex-bully all but pleading for her brother-turned-sister to show some clemency.

But Emily, despite her obvious discomfort, felt a masochistic glee at being so horribly treated as a common slut, and not once did she truly try to pry herself free from James. She used one hand to squeeze James' asscheek, the flesh toned yet soft and supple. The other hand, she used to finger her pussy.

"You naughty ****..." James said breathily, leaning forward slightly, "You really want it, don't you?"

The look in Emily's eyes told her all she wanted to know, and she came deep inside Emily's throat.

"F-Fuck...!"

James held tightly onto Emily's head, pressing her nostrills deeply into her crotch and making her struggle to breathe as rivers of semen coursed down her throat, a salty-sweet taste on her tastebuds.

It was like heaven, feeling Emily's throat constrict around her cock as it spasmed, and James loved every minute of it.

Then, when she finally finished cumming, she pulled out and sat down on the bed, seeing Emily cough out the sperm clogging her throat and gasping desperately for air.

James allowed her a few minutes to regain her breath, and she smiled at the sight of her stomach distending with the amount of cum inside her stomach. And then, an outstanding miracle happens before her very eyes.

Emily's breasts were a rather small B-cup, but they visibly expanded so much they were a big D-cup, and her hips grew until James could smack them and make them jiggle like jelly. At the same time, her stomach receded, as if the semen was magically absorbed by her body.

"W-What the hell...?"

Emily's disbelief mirrored James' as she examined her body, but James soon broke out into a smile, smelling her arousal miles away.

"Come over here, slut," Said James, "It's time for the main course."