Sorry it's long
Based on a dream I had last night.

I come to in a room that I’ve been in for a long time. I’m not unhappy there, but I’m not comfortable. I’m not supposed to be comfortable. There aren’t any windows, and I can see the hardware of multiple locks on the door. I’m on the thin side but I don’t feel underfed, maybe a little overworked. The floor is just drying from the last time I’d been washed off, because I have to be clean at all times. It’s not an act of care, but of maintenance.
The sound of footsteps rise from the other side of the door. My cock twitches in a way that still surprises me every time. The muscles in my stomach tighten and my heart beats faster. Is she just passing me by again, or is it time? One by one, from top to bottom, the locks are undone - sending metallic clicking sounds echoing through my sparsely furnished room. The last lock opens with a loud clang, followed by a thunderous groan. First I see the heels, and then the long legs that proceed them as she enters the room. I can always tell when she’s just arrived from work, and I can always tell when it’s been a rough day. There was a tone of voice, a tension in her body. I adjusted my posture and collected myself, careful not to look her in the eye.
“Already hard…” she says flatly. I look down with embarrassment and surprise, realizing that I didn’t even feel my erection come on. On the outside my long cock had been a point of pride, but here it meant nothing. It was another appliance, a toy. I sat still and remained quiet, suppressing the apology I felt was necessary for my discretion. I wasn’t allowed to watch her undress, but I could hear the sound of rustling clothes and the thud of shoes hitting the floor. The last time I didn’t assume the first position she became very frustrated with me, so I laid down laid down on the mat in the center of the room and opened my mouth.
“Open your eyes…” she said in a firm tone. I could already feel the heat of the feet placed on either side of my head. Her naked ass brushed against my chest as she found her balance. I opened my eyes as commanded to her dripping pussy hovering against my face. Looks like we’re starting with face sitting today. That’s always the sign of her long day, and usually the sign of a long session. She was just getting started.