It's the middle of the night. You hear a knock on the door. You know it's too late already to receive visits, but you open it anyways despite your better judgement. You slowly open it and then...

*BANG!

Koyori tries to force it open, but the chain locks saves you.

"Ahh...! A-assistant... Fancy meeting you here..."

She says to you as she pants heavily, moaning softly between each words, her eyes looks deep into yours, her cheeks are flushed, her thighs brushing against each other.

*BANG! BANG! BANG!

She kept trying to force it open furiously

"Let me in! We need to mate!"

She shouts needly, but clears her throat after a moment surprised by her own boldness. Then calms down a bit

"I-I mean... H-how about you let me in s-so we can conduct a few e-experiments...?"

She replies breathlessly as she lean in closer to the gap of the door, trying desperately to get in. The sly smile of her face tells everything about these 'experiments' actually are