I want to back you into a corner Vol.1 (TL Manga)

Yoko, who works at an university as a staff, is a masochist. Her boyfriend dumps her, so she gets drunk and has sex with an older gentleman. Next day, he tells her, I want to make you cry myself. He turns out to be a true sadist! She realizes there's no love between them, but she cannot reject him... Vol.1, 50 pages