I'm sure I'll be working overtime tonight, but there's a heavy rain and flood warning and the trains are out of service. I'm alone with Non-chan, the flower of my department, who I've had my eye on for a while, in an empty office. When she comes back from an outing, her bra is soaked through the rain and I can see through it, and the desire I've been holding back until now just bursts out. I unbutton her shirt and play with her nipples, and she cries out "Ah..." and doesn't seem to resist, so I move my face to her lower body in one go. She gives me a blowjob and says, "Let's have sex until morning," and my reason flies away. We have sex all night on the sofa and desk in the office, and I cum inside her three times.