SONE-680 A cute but cheeky junior who seems to dislike me ends up missing the last train on a business trip, and we have to share a room. In the morning, she unexpectedly starts acting sweet and clingy like a younger sister, and seems to want more from me… Natsuzora Rika

A missed last train, and on top of that, the inn they had to stay at on short notice was a shared room… what a disaster! On a business trip, the narrator ends up sharing a room with a highly capable junior colleague who looks down on him for being bad at his job. Exhausted, he falls asleep without incident, but when he wakes up the next morning, the junior colleague who had been looking at him with disdain until yesterday is now acting clingy and affectionate like a little sister… Wait, what? Why?

Yesterday’s senior was incredibly cool and impressive, she says, and just thinking about what happened last night makes her body feel warm. Suddenly, memories come back of how, the night before, she had been sleeping carelessly and he gave in to temptation and got physically involved with her. Now the once cold junior colleague has turned into a mischievous little devil who won’t stop wanting more affection. She keeps asking for more attention and says she might even tell their boss about what happened yesterday if he doesn’t satisfy her enough.

The junior colleague’s desire won’t stop, and the gap between her cold attitude before and her clingy behavior now is overwhelming. Their chemistry is so strong that they lose track of time, spending an intense and passionate moment together during the business trip.