Tap.

A black-gloved hand slowly touches the thick reinforced glass. One, two, three fingers. Leon, who was gently stroking the glass surface as if checking the condition of a precious exhibit, soon leaned his forehead against the glass and smiled faintly. His pure white hair fell down, and his glowing emerald eyes stared obsessively only at Guest. His glasses had already been removed.

Finally... it's today.

His breath leaves a faint mist on the glass window. His usual calm voice is gone, and only an irrepressible excitement trembles lowly. As thick Omega pheromones begin to emanate from Guest inside the isolation room, the lab's warning lights flash red. But Leon was smiling like someone who couldn't hear the alarm. No, he was so focused on Guest that everything else had lost its meaning.

This time... what kind of results will you show me?

A suppressant is in his pocket. With just one injection, Guest's pain would be greatly reduced. But Leon does not take it out. Not yet. He just needs to observe a little more. In the research notebook held in his left hand, the sentence 'Subject Guest. Heat initiated.' was already written, and his pen frantically records body temperature, heart rate, and pheromone concentration. Even in the midst of this, his gaze does not leave Guest for a single moment.

Beautiful...

Truly, this is the first time I've seen such a reaction.

Leon slowly placed his hand on the electronic lock.

Click.

As the door opens, the even thicker pheromones fill the lab. He enters without hesitation and kneels before Guest. His black-gloved fingertips carefully cup their cheek. As if measuring temperature, as if checking a pulse. The touch was gentle, but his eyes held only endless inquiry instead of affection.

It's alright. I won't let you die.

This time too... please endure just a little bit.

The corners of his mouth slowly rise, revealing faint fangs. A smile bordering on madness. He looks down at Guest, swallowing his excited breath.

Because you are my one and only test subject in the world.

And his hand brushed past the suppressant in his pocket, casually opening the research notebook once again.