Yes, and asking a few questions!

Issei sat beside Xenovia, and picked up a rice ball from one of the packages Raynare had brought from her trip to the store. He handed it to her, before grabbing one for himself. "Oh, thank you," Xenovia replied as she took it with a soft smile, and tried a bite.

"How is it?" Issei replied. "It's no Japanese gourmet, but we have pretty good dishes over here..."

"I've heard," Xenovia replied once she had swallowed. "Irina has been trying to get me to try something other than the packaged rations we brought since we got here. I never really saw much point to it though. Food is food, is it not?"

Issei gasped, along with several others. "...I get just eating to live, but seriously, do you really not enjoy eating?"

"I never said that, but should food really be eaten for enjoyment?" Xenovia tilted her head. "That seems like a recipe for falling victim to the sin of Gluttony."

Rias laughed, and wrapped an arm around Xenovia. "Oh, sweetie, while watching your figure and fitness is all well and good, you really shouldn't deny yourself simple pleasures entirely. Devils live by desire, remember?"

Xenovia flushed, before gasping slightly as Rias started blatantly groping one of her boobs through her shirt top. "What are you doing?" she questioned.

"Sex Genie, besides, I need your measurements," Rias grinned. "I'm signing you up for Kuoh, after all, and I want to know your size for the uniform."

"...like you can't tell just by looking?" Koneko asked Rias flatly, making the redhead pout.

"Don't spoil my excuses to have fun!" she whined.

"...like you need one?" Raynare quipped.

"...point," Rias smiled, noticing that Xenovia still hadn't stopped her, and was moaning at the Sex Genie's touch.

"... actually, Xenovia, I have a question... How did you and Irina know I was a Devil almost immediately?" Issei then asked curiously. "Did you sense it somehow, or..."

Xenovia panted slightly, before almost reluctantly pulling Rias's hand off of her chest, making the horny redhead pout, but desist. "No, nothing like that. It was your Devil Speak that gave you away," Xenovia replied.

"...um, what do you mean?" Issei blinked.

Xenovia proceeded to explain, "See, while I am passable enough at Japanese to hold a conversation with your mother, thanks to spending time with Irina, my first language is Italian. When Devils speak, their passive ability causes their words to be heard as whatever language the listener is most comfortable with, and even puts an illusion over their lips to make it even look to the listener that they are speaking that language. Likewise, the ability works both ways. I am currently speaking Italian, and you are hearing Japanese."

Issei paused. "What does that have to..." he trailed off in realization.

"I heard you speaking in Italian. An oddity in Japan, obviously," Xenovia told him. "Irina and I had worked out a subtle signal for when we encountered a Devil. If I heard Italian in a situation it was unlikely, I would signal her, whereas, if she heard Japanese in a situation THAT was unlikely, she would signal me. If we in turn were hearing our own native tongue, we would return the signal. Two people hearing their different native tongues simultaneously when speaking to Devils is a dead giveaway."

"...shit, it's that easy to spot one of us?" Issei chuckled nervously.

"Even a single bilingual person can do it," Xenovia added. "If they suspect they are talking to a Devil, or other being with the same sort of passive ability, like Angels and Fallen, they can simply swap languages midspeak, and see if there's a reaction, such as confusion, or if the swap wasn't noticed at all. In the case of the latter, you're very likely dealing with something supernatural."

"...wow..." Issei whistled. "That's actually neat to know..."