Beelzebub, of course

Lucy glared up at Beelzebub as she grabbed another card from the deck, The Great Fly smiling smugly at her hand. The CEO of Hell let out a low growl as she looked down at her hand.

An Ace, a King, a Queen, a Jack, and a Ten of Hearts. All red in color.

Lucy's frown turned into a smug grin as she looked up to Beelzebub.

"Well, looks like the spider caught the fly." She said, causing Beelzebub to look up from her hand in confusion. Lucy laughed as she slammed her cards down on the table, revealing her hand. "A Royal Flush! Read it and weep! Oh, and good luck on your little journey, Beel. I'll be sure your dimension is toasty warm before I kick your naked butt back into it."

Beelzebub blinked a few times as she looked at Lucy's hand, her eyes slowly making their way to her own hand as she sighed. "Well, a deal's a deal, Lucy." She said, hanging her head. "That's a hand I just couldn't beat with this..."

The Great Fly laid her hand out, revealing four Aces; two black and two red. Lucy looked down at the cards and couldn't help but cackle like mad.

"And now you know why mortals chose to replace you with me, you insignificant insect! I -" Lucy gloated, only to stop as she realized something. She had put down five cards, but Beelzebub had only put down four. Indeed, looking back up, Lucy could see Beel looking over the last card in her deck that was still in her hand. "What is that?"

"Oh, this?" Beelzebub asked innocently as she gestured to the card in her hand. "It's just a little insignificant and unimportant card that humans usually take out, but you didn't. I believe it's called a," she smiled impishly as she laid down her card next to the four aces, "'Wild Card', or something."

Lucy gasped in horror. That was The Joker! In her efforts to prove Beelzebub wrong about her gambling problem and remove the smug smile from the fly's face, she had forgotten to remove The Joker from the deck! And with that card combined with the four Aces meant that Beel had...

Oh no.

Oh no!

Beel had Five of A Kind! The only hand in existence that beat a Royal Flush! And that meant...

"I... I... I..." Lucy stammered, completely flabbergasted at her bad luck. She couldn't finish the sentence.

"I win." Beelzebub said in a sing-song voice, giving a smug smile to Lucy. "Good luck, Lucy."

"N-now hold on!" Lucy said nervously, actually begging. The two powerful demon ladies knew that was out of character for The Queen of Hell, but it was understandable given the details of the wager that Lucy herself had put forward. "B-best two out of three, perhaps?"

Beel pretended to think about it for a second, the smile never leaving her face, before shaking her head. Before The CEO of Hell could do anything, The Great Fly gave a wave of her hand and Lucy vanished in a puff of smoke...

Leaving behind her red blouse, black dress pants, black shoes, and black satin underwear.

With a smile, Beel jumped back into her portal, summoning a seat and a one way portal window to enjoy the show...