Fuka Kouryoku

Tomoyasu and Aki work at the power company.

They are dispatched to review a building in the final stages of construction.

Inside the building, which is for a drug manufacturer, a sudden
accident throws the doors into lockdown! Tomoyasu and Aki are
quarantined. There are three other women who can help,
but only using the combined power of their rectums...

[From DLsite English]