During a company trip banquet, the big-titted female coworker I'd always teased got drunk and started showing her vulnerable side, her yukata slipping to reveal the deep cleavage of her large breasts and her underwear. Turned on by the sight, I reached over and touched her while we sat side by side. I created a private moment away from the others, and we began touching each other passionately. After the party ended, I coincidentally ran into her in the restroom. Seizing the chance of being alone, I removed her yukata, groped her body all over, and she became sexually excited as well. I then invited her to the midnight hot spring, and in the empty bathhouse, we had intense sex. After our first round, we continued with a second round right in the bathtub.