In the first two parts, Marty, using a time machine invented by Doc Brown, visits the past and the future. In the process, he manages to fuck his mother, grandmother, daughter, granddaughter, sister, and other relatives. "Back to the Future II" ended with a delivery man giving Marty a note from Doc telling him that when lightning struck the DeLorean, which housed the time machine, he was sent back to 1885. The DeLorean had been damaged beyond repair. The note described where it was hidden and how to repair it using 1950's technology. Marty was instructed to fix the DeLorean, return to the 1980's, and destroy it before any more harm could be done to the space-time continuum. Under no circumstances, the note emphasized, should Marty attempt to rescue Doc from 1885. He was happy and planned to spend the rest of his life there.
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Marty stared at the note in disbelief. He would need Doc's help to fix the DeLorean. Fortunately, Doc's younger self would be available since it was Doc from the future that was stuck in 1885. Marty took a shortcut to his house through a cemetery. He tripped on a tombstone. His flashlight illuminated the inscription. Marty was stunned when he saw who it was and how he had died. He had to get to Doc quickly.
"Marty, what are you doing here?" Doc asked with a look of shock on his face. "I just sent you back to the future."
"Uh yeah Doc, about that..."
It was true. Doc had sent him back to the future, but things had gone wrong. Marty explained how the future had been altered by Biff and why he had to come back to fix it. Then he showed him the note he received saying that Doc's future self was trapped in 1885 and providing instructions about how to repair the DeLorean.
"My future self is right, Marty. If I help you get back to your time, you must destroy the time machine before it does any more damage."
"It's not that simple Doc. There's something I didn't tell you. Your future self was killed in a gunfight on September 7, 1885, just six days after you sent the note. I saw your tombstone when I was running through the cemetery. If I don't go back and save you then who knows what will happen."
"Great Scott. You're right Marty. The space time continuum could be completely distorted if I were to die. You have to go back before it is too late."
Marty went into town to buy a cowboy outfit so he wouldn't look out of place in 1885 while Doc repaired the time machine. Marty had just walked out of the clothing store with his packages when he ran into Lorraine and George, his future father and mother. This was the worst possible thing that could happen. He had worked so hard to get them together and restore the future.
"Marty, what happened to you last night?" Lorraine asked. "You left me alone in the car at the 'Enchantment Under the Sea' dance and that brute Biff tried to do horrible things to me. George came along and rescued me, didn't you Georgie?"
"Uh, oh, um... yeah," he stuttered.
"He was a real gentleman and took me to the dance since you abandoned me. We were just on our way to the soda shop. George, why don't you run ahead and get us a table. There is something I need to discuss with Marty. I'll be right there."
"Um, okay Lorraine. Uh, bye Marty."
"I'm glad you and George had a good time last night," Marty said as he watched his future father walking away. "I think he's a terrific guy. He just needs a little help coming out of his shell."
"Ha," Lorraine laughed. "George may be a nice guy but he's not much of a man. Do you know what he did? I was going to give him a little reward as a thank you for saving me from Biff, but as soon as my hand touched his lap he shot his load. Then he did it again while we were slow dancing. I don't know why I asked him to come to the soda shop with me this morning."
"It's because you see the good in George," Marty argued. "He is perfect for you. You need a man you can mold... one who will do anything you ask."
"Maybe," Lorraine replied, stepping close and running her hands up Marty's chest. "But I would rather be with a real man like you Marty. You know what I need."
She backed him against the brick wall of a building and slid a hand down his body until it was rubbing his cock through the jeans he was wearing. Memories of her talented mouth and hot pussy made it jump to life. Lorraine pressed her lips against his neck and nibbled on the thin skin.
"Stop it Lorraine," Marty protested, making a feeble attempt to push her away. "I'm leaving today and won't be back. It's why I left you last night. Go to George. He's a good man. We don't have a future together."
"But you're here now, Marty," Lorraine whispered into his ear. "Fuck me before you go. It's the least you could do after abandoning me last night."
Her hand continued to rub his hard cock. She pushed her tongue into the cavity of his ear. Her body was pressed tightly against his. He could feel her soft breasts poking into his chest. Marty felt his resistance weakening. He made one last attempt to extricate himself.
"Not here, Lorraine. We're in public. Besides, George is waiting and I have to go."
"Then we'll just have to go someplace else," she replied.
Lorraine grabbed the bag with his cowboy clothes and ran around a corner into an alley. Marty chased after her. When he got there he didn't see her. He called out but she didn't answer. He slowly walked down the alley trying to figure out where she could have gone. Suddenly two hands pulled him into a recessed doorway. She threw her arms around his neck pulling her body tightly against his.
"I need you to fuck me Marty. Right here. Right now."
Lorraine sunk her teeth into his neck. Her hand fumbled with his belt and zipper. She reached into his jeans and wrapped her fingers around his hard flesh. Lorraine slid down his body pulling his jeans and briefs around his knees. Her warm wet mouth quickly engulfed his throbbing cock. Her lips traveled down its length. Marty felt his resistance quickly dissipate in a sea of lust.
Knowing that the person sucking his cock was his future mother somehow made what she was doing more exciting. He put his hands on her head to help guide her bobbing motions. He thrust his cock deep against her throat each time she plunged her lips down his length. He could hear the loud sucking and slurping sounds she was making. Spit drooled down his shaft and dripped from his balls.
Lorraine opened her throat and let his cock slide deeper until her lips were pressed against his pubes. Her tongue pushed out from her mouth and licked his balls. She moved back up his length and teased his knob with her lips and tongue. Marty was about to unload when she pulled away and looked up at him with spit drooling from her lips.
"I love sucking your cock Marty, but now I want you to fuck me like you did last night. I want it hard and rough. I want you to choke me and pinch my nipples so hard that they hurt."
Lorraine reached under her skirt to remove her panties, then stood and kissed him hard biting his lower lip with her teeth. She licked off a tiny trickle of blood running down his chin. Lorraine stepped back and ripped open her blouse. She removed her bra exposing her breasts and hard nipples. Then she slapped him across the face.
