It started out like any other day.
I crawled out of bed while Master slept, brushed my teeth and ran a comb through my hair. I did the few chores I normally started before he got up, and then made his breakfast. I woke him with his morning blowjob, kneeled beside him while he ate, and scrubbed his body in the shower while he got ready for work. I made his lunch and then waited patiently by the front door while he finished getting dressed.
On a normal day, he would have grabbed his bag, patted me on the head, and walked out the door. But today was not a normal day.
Instead of sailing past me, he stopped and clipped my leash onto my collar. He pulled me out the door and turned to lock it behind us.
I blushed as I trotted after him toward his van, praying none of the neighbors would be out to see my nakedness. I instinctively headed for the passenger side door, but was brought up short by a tug on my leash.
"Over here, you stupid bitch," he said, yanking me toward the double doors in the back.
I scurried over to him and waited while he opened the doors and grabbed a rolled rubber mat from inside, spreading it across the floor of the van. When that was done, he unclipped my leash and swatted me on the ass, so I hopped obediently into the van.
I kneeled on all fours while Master climbed in behind me and began strapping me into place. He fastened my hands and knees so that I was on all fours, but immobile, secured to either side of the van. He ran a chain from my collar to a metal ring in the floor below me, giving me just enough slack that I could kneel comfortably, but not enough to move from that position. When he was happy that I was secured in the position he wanted me, he crouched in front of me, grabbing a handful of hair and pulling my head back.
"Today is going to be a stressful day, slave. So I decided I'd bring you along, so I can fuck that whore mouth of yours any time I need to de-stress." With that, he shoved a ball gag into my mouth, fastened a blindfold around my head, and climbed into the front seat.
I expected to get dizzy from riding in the back of the van, but I am secured too tightly for that. Only my tits swing free with the motion of the vehicle, and my Master laughs as he looks back and sees them bouncing and slapping against each other.
Master makes his first service call, leaving me in the van for almost an hour by myself. He ignores me when he returns; I am no more than a tool to be used now. After the second call, he slams into the van. I can hear him shifting around, but I am still unprepared when he yanks my ball gag off and slams his hard cock into my mouth. I gag around him, but he ignores me, fucking my face hard and fast. He slams his cock deep into my throat and holds it there, while I struggle to breathe, pulling at my bonds. A few more hard thrusts and he cums hard, flooding my mouth and pulling back to spray some on my tits and face. I lick what I can, panting hard, and he chuckles as he shoves the gag back into my mouth.
Soon we're on the road again. After two more stops, I feel an urgent need to pee and begin whimpering softly. He ignores me for a while and then reaches backs, pulling the gag out.
"What is it, slut?"
"Master, I must use the restroom." I blush furiously as I say it.
He looks over his should at me like I'm an idiot.
"What the hell do you think the rubber mat is there for, slave?" With that, he shoves the gag back in, and continues driving.
I'm too embarrassed to simply let go, so I hold it as long as possible. Master goes in to another job and I am nearly crying in pain from holding it by the time he comes back out.
He opens the back doors this time, exposing me to anyone who may wander by. He makes a tsking sound when he sees I haven't tinkled and I hear him unbuckling his belt.
"That lady was a bitch, pet."
