Zombie Story (futa on male, futa on female, and forced oral)

I am new to the story writing but i have been writing a story of my own I draw from several sources from movies porn and other stories i've read here any feedback would be greatly appreciated i've currently have hit a roadblock at the end but i wil finish Here it is and that's just the working title for now

It has been 6 years since he first saw her in his General Biology class at Central State University; he was immediately drawn toward her quiet shyness. He waited until class was over and he asked her to go to a movie, she declined saying she had to study. He offered to help her study & she agreed. They met at the library and picked a room on the third floor so they wouldn’t be disturbed; they cracked open their books and he was surprised to find her abundance of knowledge on the subject of skeletal systems in higher mammals. Confused, he asked why she needed to study if she knew it already. She confessed it was all a ruse to get him alone; he laughed nervously and said “you could’ve just told me.”

She pushed a chair against the door and grabbed him forcibly by the collar and pinned him against the wall. He was shocked how strong she was; she began kissing his neck, below his left ear, his cock took notice and began to harden she began nibbling on his neck. Amused at his sharp intakes of breath with each fresh bite she whispered into his ear that she too from the beginning of class had found him attractive and she was waiting for him to make his move. He began slowly unbuttoning her shirt as she fiddled with his zipper. Slowly unzipping, slowly allowing his now fully erect cock free; it was 10 inches long and about 4 inches thick and the head was firmly pressed into her bellybutton. He removed the last button to find no bra her DDD breasts popped from behind their constraints. He pinched the left nipple as he hungrily sucked on the right alternating between biting and licking the engorged nipple. He loved the way she moaned as he sucked; he alternated between nipples and her lips. She bit his lower lip and pulled it stretching it; she looked into his eyes and dared him to move. Not one to be shown up he pulled both nipples until she couldn’t stand it any longer. She let go off his lip and licked the side of his face from his mouth to his eye. He paused.

“What the fuck was that,” he said.

Chuckling she put her hand around his neck and shoved him into the wall so hard the picture hanging on the wall fell to the ground.

“Hey!” he said. The corners of the room were starting to blur. all of a sudden he could see was her once angelic now demonic face she said almost laughingly “I’m marking you as mine .” his br