On Valentine's Day, my girlfriend had an affair with her boss

Karen Yuzuriha just graduated but was immediately accepted to work at a pretty good company. The boss said he prioritized her because her appearance was quite good and suitable for the job of receiving guests. Today is Valentine's Day, but she has to go away on a business trip, leaving her boyfriend at home feeling very lonely. He was worried and called her continuously but to no avail because Karen Yuzuriha was drunk and all night she became a sexual tool for her big boss. It is truly painful for a boyfriend to fall in love with his lustful and easy-going girlfriend.