Billionaire Bought: My Billionaire Boss, Part 6 (A BDSM Erotic Romance)

Delilah's past has caught up with her and the secret she has been carrying far too long can't stay hidden. When Jackson Stone finds out the truth, he must punish her for betraying him. After the bachelor auction, he'll have his way with her...
This is the sixth part of the "Billionaire Boss" series by Emily Cantore and is 9560 words long.
EXCERPT:
"I found contracts today. They had your name on them..."
"You don't trust me." He voice was low and hard.
We pulled up in front of his mansion and Mr. Stone turned to me. "Come with me. Now."
I followed him out of the car and up the front steps, my stomach churning. He took me by the hand and pulled me inside and up the stairs, heading for his study. We stopped in there and he suddenly turned and grabbed the leather collar around my throat.
"You need to be punished for your lack of trust," he said.
I felt the strength of his body close to mine and trembled at the tone in his voice. Why had I said that? He'd opened himself to me and my response was that I found contracts with his name on them? I could have said anything and I blundered in with that?
Mr. Stone opened the door to his sex dungeon and pushed me inside ahead of him, never letting go of my collar.
We stopped in the middle of the room and I saw the bench he'd tied me to before going down on me with a mouth full of hot tea.
"Take off your clothes," he said in my ear.
I complied, slipping out of my dress and stepping down from my high heels. Without any warning Mr. Stone smacked me on the ass, the crack of his hand echoing through the room. I squealed and tried to turn away but he had hold of my collar.
"You will answer yes, sir."
"Yes, sir," I said quickly and wiped away a tear.
"I said to take off your clothes," he said.
"Yes, sir," I said and unclipped my bra before slipping my underwear off. He kicked my pile of clothes to the side and continued to stand behind me, holding my collar. I could hear his breathing, low and fast and despite the sting on my skin, or maybe because of it, I felt myself getting wet.
"Over here," he said and pushed me towards an angled padded bench. At first I had no idea how you were meant to use it and then I saw the padded shelf at knee height. I stepped forward and knelt. My body went over the top of the bench, my hands hanging down either side. In this position my ass was sticking out and I knew that soon, Mr. Stone would punish me.
He let go of my collar and then I felt his hands on my ankles, securing them in leather restraints. With each movement and moment, I felt myself getting wetter. Felt myself tensing in anticipation of his hand hitting my ass.
The smack didn't come though. He walked around in front of me and secured my hands with leather restraints also. I was almost pulled flat against the bench now, my breasts rubbing against the padded surface.
Once Mr. Stone had me secured he walked away. I tried to see where he was going but I couldn't move. I heard the door to the next room and the distant rustling of papers. I held my breath but he didn't make any more sound.
"You didn't trust me, slave," Mr. Stone said from behind me.
I yipped and then let out my breath. Of course he'd be able to sneak back in behind me without me hearing anything.
"How many letters are there in Matt Black?" he asked.
I quickly counted them out. "Nine, sir."
"And how many letters in Jackson Stone?"
"Twelve, sir."
"So twenty-one for your lack of trust. And then..."
I felt his hand stroke across my ass and then his fingers cup my sex. I moaned as he moved his hand, his middle finger slipping inside me for a moment. He kept moving, stroking his finger over my back entrance. His finger moved in a small circle and I felt pleasure starting to build, mixed with fear.