In various situations, I wondered what would happen if there was a hidden XXX (discussion), and based on that, I thought about the settings and contents (delusion). Although there are handjobs and blowjobs, it is like an office case so that you can pull it out with a feeling of air. This work is a story of a slut / M woman who secretly acts silently under the desk when there is a third party in the classroom, office, home, etc. or when it should not be done.