To find it, navigate to (use an ad-blocker and antivirus), search "Fuufu Koukan Modorenai Yoru," and look for the 28-minute OVA tagged with "Workplace" and "Psychological." Alternatively, search the raw Japanese DVD name: Kafun Shochu: Fuufu Koukan – Modorenai Yoru .
AnimeOnlineNinja hosts an adult OVA (or a specific episode) titled Fuufu Koukan: Modorenai Yoru , with a plot centered around a "work" environment—likely two married couples working at the same company, leading to a disastrous spouse exchange. animeonlineninja fuufu koukan modorenai yoru work
Based on those tags, the work in question is almost certainly: To find it, navigate to (use an ad-blocker