Nice one tessa!
Despite the fact you found it hard at first to get used to not using the spell checker, you did a great job. It seems that once you forgot about the task and just wrote from your heart, you were fine.
There are no major changes needed. As annoymouse pointed out, watch out for the use of too many explanation marks. You have a good grasp of commas, and I found only one place where one is needed instead of a full stop, and that after "this" in the following sentences.
I will say this. It was wonderful to sit and talk with someone whose jaw didn’t drop to the floor when spankings or being tied up were mentioned.
I loved the atmosphere of the story, and could relate so well to the anticipation of meeting someone you know online. It flowed very well and I wished I was there with you!
Thanks again and you can move onto the third assignment as soon as you wish.