Leave out the hypnosis, stick to the more 'realistic' details

I should probably explain the hypnosis. After all, it could happen to him, and... well, how else is he going to understand that Emily dumped me for my ass? Even sitting at the cafe, thinking about it, it sounded so silly. But the reality of it was far from humorous. It made her stomach clench in a quivering fear, and her cock twitch erect from arousal.

No, don't explain that, you idiot. She shivered, hearing that voice again. There's no need for that at all. He'll understand the truth anyway, trust me.

Looking down at her coffee, Lily decided to do what the voice said. Besides, she could always tell Jake about the hypnosis later, right? "...Emily really liked it? My a-ass, I mean."

Blushing, Jake couldn't meet Lily's eyes all of a sudden. "I mean... I can understand that. It looks amazing on you."

"Thanks, honey." The compliment didn't really hit though. For some reason, it didn't feel like the praise really extended to her, like her ass was its own separate entity, worthy of compliments all on its own. "But, the thing is... Emily really liked it. So much, she..." Tears started to well up in her eyes as she struggled to get the words out, her sadness as equally inflamed now as her libido. "...she broke up with me." She reached out, brushing the tears out of her eyes.

"Oh sweetie..." Jake got up, walked around the table, and pulled Lily into a soft hug. "That's so strange, I don't really understand her reasoning, but... you're wonderful, you don't need her."

The embrace was nice, it helped soothe her bruised emotions, but his words rang hollow. Am I wonderful? She gave her boyfriend a kiss on the cheek, then gently pushed him back towards his seat. Ever the good boy, he took the hint, and went back to his side of the table.

Biting her lip, Lily dropped the biggest bomb of all. "The thing is, Jake... the reason she's not dating me anymore, is that she's just dating my butt." His eyes widened, and Lily quickly added, "I know that sounds weird, but it's what happened. It's... the reality I'll just have to get used to, I suppose." Even though she could still fix that situation with her ass, with the hypnosis, that was seeming more and more unlikely by the hour. The new status quo was starting to feel solid, and Lily didn't know if she had the willpower to shake it up.

I'm not sure why you'd want to. Your girlfriend gets to be with someone actually worth her attention, and you still get the pleasure from it. Hell, you might enjoy being cuckolded by your ass even more than you did dating her yourself. Such a filthy pervert.

Lily was so busy focusing on this conversation, trying to tune out the sneering voice in her head, that she completely missed the building pressure until it was too late. This fart was brassy, loud, and she knew that people were looking at her. "E-excuse me..." It was so embarrassing, but as the rank smell hit her nose, she once again felt proud of herself, satisfied with it, and...

The voice laughed in her head. You're horny, Lily. You don't want to admit it, but you really should. I don't see what's so strange about it, really. Of course my voice is sexy enough to turn you on, you pathetic gooner.

Jake, meanwhile, flinched at the smell, but didn't comment on it, focusing instead on Lily's pain. "I won't pretend I understand this, any of it, but I can see you're hurting, and I want to help. What can I do to help?" The obvious pleading in his eyes and voice made her smile. Jake was so earnest, so **** to make her happy. It was enough to forget all the mean things that voice, her ass, had said to her.

Since they'd both finished their coffee by this point, she sat up and took him by the hand. "In that case, you're going to take me to your place, and we're going to have a wonderful afternoon together." Then she leaned in, whispering in his ear. "You'll make me feel good, won't you honey~?"

"Y-yes ma'am!" He did as he was told, and after a short ride in his car, they were in his third floor apartment. It was small, just a one bedroom, but it felt cozy. Still, once the door closed, she knew what is was time to do.