The Alpha's Substitute Virgin Bride

What a ridiculous thing happened to me!
I was sent as a substitute for my sister for just one night but I ended up marrying her supposed husband.
“What are you doing? Are you not aware of the reason for which you're here?” He said and sat on bed. I sat straight and curled my legs.
“I…I…but I'm a virgin and the thought of all this is what scares me.” I said and Greyson gave me an evil smirk.
My voice wasn't supposed to sound this weak and pathetic but I can't hide my emotions.
“You have nothing to fear. I'm the man who would be marrying you. Think of this as our marriage consummation.” He said and my eyes brimmed with tears.
If only he knew that I am not the woman he would be marrying. I am simply her substitute. I thought to myself.
Greyson reached out to my legs, and dragged his fingers on them, and pulled me by the legs to himself. He frowned when he saw that I still wore a mask and suspicion took over him.
“Remove your mask, Bella. There's no need to hide your face from me. He said and I shook my head. Greyson tilted his head, and his eyes became cold.
“Remove the mask, Isabella Walters!” He said authoritatively and I gasped.
This was trouble!