Love Me Tender at Midnight.

“Sex makes you sleepy” —the night I took the plunge, believing those words, was a secret, sweet remedy just for me. Subaru, a high school teacher suffering from insomnia, turns to a lesbian sex service in desperation to get some sleep. There, she meets Tsuki, an escort who provides her with the ultimate comfort, but later, she shows up at her school as an administrative staff member—!? A secret yuri romantic comedy about an insomniac female teacher and a lesbian prostitute who heal each other’s lonely nights! (Source: Cune, translated)