You go undercover as this girls boyfriend and encounter something in the bathroom. [Nina's POV]

You are just a normal guy on vacation with his girl.
Yup.
Super normal.

Okay, this should be fun. Getting to be someone else? A big strong man, no less? It should be a gas!
But it isn't.
This woman is dragging you all over the resort. She takes you to the pool and the bar and whatever else she facies and you have **** but to go along so you don't draw any suspicion. And all the while, people keep looking at you. Men, women, others, all sizing you up like a piece of meat. You hated that when you were a woman and you hate it now!
Though, it does give you some good intel. All of your oglers have green eyes. You thought it was a trick of the light when you first saw it but it kept happening. That must be a sign of demon possession. Although, as you find your reflection in the bathroom mirror, your new form has green eyes too. So it's a sign of regular possession too? Whatever. It makes you harder to find so who cares.

Peeing as a guy is way easier.
Girls have to sit down and wipe and all that stuff. Guys can just stand and do it wherever.
It's not very fair.
Well, girls have multiple orgasms so you guess it balances out.
You managed to shake... Girlfriend... when she sat at the poolside bar. You went to the bathroom and got to take a breather. You just kinda stand there and try to draw up a game-plan.
If your gonna stay human, you have to find out more about your new self. Both of them. The man and the demon. The man shouldn't be impossible. He should have some ID back in his hotel room. Maybe the demon got something to help him blend in better? Who knows.
Knowing the demon is a harder task. After all, the whole point is that they aren't known, right? So, how are you gonna-

-CLONK!-

The sound of the door slamming open and closed nearly gives you a heart attack. An Asian guy with spiked hair walks in, stopping short when he sees you. He's on the wiry side, like he works out but not that much. He's wearing a tank top and a pair of loose swim trunks
"Kurzon!?"
You barely say "Uh-" before he pulls you into a bear-hug.
"Oh man, it's been forever!" He says, slapping you on the back. "I saw you at the last hunt but I didn't get the chance to say hi. Man, you got a nice fuckin' mount, dude!"
You say, "Do I know you?"
He seems taken aback for a second before realizing.
"Oh, duh! You don't recognize me. New mounts, a-doy!" He says. "I'm Jigen! From Class 9. Remember?"
Well, speak of the devil-spawn...
You feign recognition.
"Oh shit!" You say. "Hey, man, how've you been!?"
He laughs. "I've been good man, been good!"
"I finally got a mount! It's been wild man!" He says, walking over to the nearest urinal.
Like your not even there, he drops his pants and starts pissing, ass out. You try not to react to this. He just did it without even thinking. These demons don't even see stuff like this as weird. These bodies aren't theirs, so why should they care?
You try to play along, walking over and lean against the stall wall next to him.
"This whole thing's been a trip, man. I've been going crazy with all of this sex stuff. You tried it?"
"Yeah." You respond. "It's pretty cool!"
"No shit, it's cool!"
When he finishes, he doesn't even wash his hands. Ew.

"Hey, man, I gotta tell you, I'm real jealous of your mount, man." Says Jigen.
"I mean, this one I've got has a big dick but other than that it's kinda lame."
You respond with "Aw, don't say that. Your mount is great. I'd go for him."
"Yeah? That's nice of you to say, man."
Then he turns to you and says, "Hey. Why don't you show me what you've got down there?"