By now, after the second Army member through had the under-skin device giving signals but the signals were unable to be localized, it was generally accepted that going through the Portal was a one-way trip. That didn't mean there was a shortage of volunteers. Army life can be... routine, and sometimes people want to do things other than routine.
Bill Thomson was one such person. They weren't bothering to send equipment or a tracking device with him.
"Good-bye, Bill, and good luck."
"Thank you, Colonel."
The door closed behind him, and Bill eagerly leaped through the energy vortex.
***
The beautiful, busty, blue-haired succubus standing over him was easily recognizable.
"Hello. I'm Bill. You must be Kurumu Kurono."
She reached a hand down to help Bill to his feet. "Correct. You're just outside Yokai Academy."
"Are you still a student here?"
"I graduated 10 years ago. Now I'm a teacher here."
"How's Tsukune?"
"Our headmaster is doing well. Inner and Outer Moka finally fused together and the complete Moka has been married to him for the past three years."
"Anything else I should know?"
"Alucard reconciled with humanity and with the Three Dark Lords. We revealed Yokai Academy to humans four years ago and have several human students."
Kurumu paused and looked Bill's body up and down.
"And... I'm currently unattached."
Bill ran his eyes over the lovely succubus. "I see."
"Just because I'm a succubus doesn't mean I automatically want to jump your bones, you know."
"Okay, I can play the patience game. What do I need to do?"
[3 weeks later]
"Thank you for helping me get a job at Yokai Academy, and for letting me with stay with you, Kurumu."
"I hear you're doing good work as a janitor/security guard, Bill."
"It's not difficult, just routine, and my previous job trained my mind for that."
"I know you've been eying my body lustfully ever since I moved you in. You have been patient, and as you guessed, I've been wanting your body as well. Succubus sex drive, you know."
"I don't know if you used your Allure on me, but you didn't have to."
"I didn't bother. It was obvious you desired me from the instant we met. So from now on, you sleep in the bed with me."
"I don't think we'll be doing a whole lot of sleeping."
"We will, just after the sex every night."
Five minutes later, the two of them were naked and in the bed, and Kurumu had transformed herself into succubus form.
"Do you prefer me this way?"
"You're beautiful either way."
They began with a soft, tender kiss.
"So you don't actually drain energy with sexual acts."
"Nope, we just make the person we're having the act with fall harder for us. But you seem to have that part covered already."