I got excited by my ex-girlfriend whom I met again at a class reunion, and crossed the line

「今日は旦那が居ないからウチで飲み直す？」同窓会で再会した元カノのノーパンノーブラ姿に興奮して一線を越えちゃった僕 小野夕

Also known as fsdss-673

At an alumni reunion, Yuki Yudzuru reconnects with his former classmates, including Aoi, his ex-girlfriend who is now married. Despite the many years that passed, they still a strong chemistry, and the alcohol does the rest.