Why not?

Hesitantly, you grab Sojin's butt. You give it a gentle squeeze, and it feels delightfully firm, with just a little give to it. You can’t believe this is happening.

“Go on, John, give it a little smack,” Yura whispers in your ear, before moving your hand into a better position so you can lightly smack Sojin’s ass.

"Harder," says Sojin. "Really give it a good one."

You smack her buttocks, smiling as you hear Sojin yelp quietly.

"Ah, that was fun," says Sojin.

"Sit back down, John, it's my turn," Minah says. "I want to know what you think of my ass."

"Okay," you say, still confused but quite excited, sitting down on the bed.

Minah sticks her behind out. Even though her pants are a bit baggy, it looks nice. You give it a gentle squeeze, and smile nervously. Minah looks back at you and smiles.

"You're blushing," she says.

"Oh, um, yeah..." you mutter, quickly letting go of her butt.

"My turn!" Hyeri says, brightly. “Smack my ass too, John, okay?”

You turn, and Hyeri sticks her butt out. It's nice and pert, and you give it a firm slap.

"Ah!" Hyeri yelps.

"Oh, sorry," you say.

"Don't be," she says with a smile. "I was just surprised you’d be so bold, that's all."

"Saving the best for last," Yura says. "Do you want to check out my ass, young man?" You nod, your head swimming, and she turns around. Her white pants are so tight that you can make out every detail of her juicy buttocks. You smile involuntarily, and reach out to gently caress and squeeze her cheeks.

"Mmmm..." Yura moans, as you give her ass a thorough feel.

"So, who wins?" Sojin says, abruptly.

You realize that you've been rubbing Yura's butt for nearly a whole minute, and quickly move your hands, placing them on your lap to try and hide the massive bulge that's formed in your jeans.

"Mmmm, our young man's got a boner," Minah giggles.

"I do not!" you say, embarrassed.

"He's hard enough to cut glass," Yura adds.

"That's enough, girls," Sojin admonishes them. "So, John, who has the best ass in Girls Day?"

"I... You all do..." you manage to say, before Minah interrupts.

"Bullshit! We saw you just now with Yura! You were practically drooling." She smirks. "Just say that I have the best butt, okay? I like to win."

You shrug. "I dunno... I think Yura's was the best..." you admit, timidly.

"Yeah, but she's wearing really tight pants!" Minah says, "It's not fair, you didn't really get a proper look at my butt!"

"Do you want me to take my pants off?" Yura asks her. "Because I will if you will. Then we can have a proper contest."

"Well, that'd be fairer," Minah says.

"Yeah!" Sojin agrees, "Let's all go again, but this time John can judge whose ass looks best in panties!" She looks down at you. "I'm wearing really nice panties today, John."

You gulp as you realise these girls are really trying to tease you – best to just roll with it, you guess.