Stretch her pussy out

Saturday rolled around fast. During the time before, I wrote a list of the things Sandra wanted to play out with me: Doctor, ****, Speculum playing, Camera on my Member, Anal...even play Dentist.
Those were the ones that caught my attention, and ones that I long to do with her. I would plant these ideas in her head and they'd be the only ones we'd do.
My Man-hood grew hard at the thought as I knocked on her door.
Sandra opened it, wearing only a robe, and brought me inside. "I've missed you." She said.
"Me too, what is it you wish to do today?"
She led me to the basement where a low medical table, with an over head lamp that also had a magnifier, stood next to the desk which had Speculums for both the pussy and anus in different sizes. The largest being for a Horse.
'She did what I told her.' I thought. 'Good.' I looked at her, "You sure you want to do this?"
"Y-Yes. I am."
I bring her over to the table and have her disrobe before laying down with her legs spread far apart. I pick up a regular sized speculum and insert it into her pussy before opening her up. I couldn't use the lamp because she was too low...until I propped up her hips using the extra pillow the med table came with.
I then went to the next size...then the next...and the next.
Sandra breathed through her teeth, her breathing rapid as I kept opening her wider and wider.
"We can stop now, if you want." I offered.
"N-No. Keep going, p-please."
'Such a brave girl'. I thought as I picked up the big one; it wasn't the Horse one, but it was still huge. I put it and opened it all the way, hitting her crevix. She held back a scream as I looked inside and saw more of her fleshy womanhood than any man. I pulled that out and readied the last one. It slid in...and I opened it up.
It stretched her wide...so wide I was afraid of tearing something. Tears ran down Sandra's face and I felt awful. "Sandra? Look at me."
She did.
"Razz-berry Rain"
Her eyes glazed over.
"Sandra, I want you to sleep. When you wake up you'll feel better and you'll take some medicine. On the count of three. 1...2...3!"
She fell asleep and I removed the Horse Speculum from her inner folds before placing it in bucket of **** with the others. Then I went upstairs to find some aspirin for my girl.
I watched her sleep until she woke, a little drained but ok. I gave her the pills and a glass of water, which she took, and then I pulled her into my lap.
"Let's not do that again." I say. "You could've been hurt badly."
"I agree. Hey, umm..." She paused. "Could you see how many fingers I can take now? I-I want to know."
"If you feel up to it." I tell her. "I 'll make you feel real good for being a brave girl."
Sandra lies back down and I put on some plastic gloves. I bring the light close to her, the magnifier giving me a larger view. She spread her legs and I carefully inserted a finger and went deep into her inner folds...very deep. It was as if her pussy swallowed it. I pulled out and then did my whole fist...her pussy took it with ease!
"You can take my whole hand, Sandra."
"Really?"
I nod, and moved my hand back and forth in her insides. I saw the bulge appear and reappear near her stomach...as if she was being teased by a large worm. Sandra's eyes were rolled back and she moaned huskily before she came.
"I make you feel good, Sandra?"
"Oh God, yes!"
I smirk and peel off the glove. "Then can you return the favor?"
She smiled and sat up. I unzipped my jeans and my rock hard member sprang free...