A Bump in the Night 6: Be Prepared
A single one of her brother's sperm cells reached the nucleus of her egg, fertilising it, and shortly after it began to divide.
Fox in a Box
The male felt that glob of cum, blinking as it heated through his waist, soon gasping and grinding upward, feeling the very sperm cell almost huge as well, grinding upward into it.
The Lessons of Love
"it goes inside her body, and just one sperm cell, sometimes, finds the egg inside her. and when it does..." he gestured, using each of his paws to symbolize the sperm and egg, and slowly brought them together to clasp. "...something happens."
Decoy II - Part 1: Blown Away
"like the vagina, the normal environment of digestive tract is a hostile one for sperm cells, as it is very acidic, viscous, and patrolled by immune cells." he was off and rambling again.
Experimental Fatherhood, Ch. 1
The same company that had done their work to fertilize the gorilla embryos also worked on human eggs and sperm cells; unfortunately, during the delivery, the institute's box had been swapped.
Alex - Inheritance
Ranger's pulsing spray of fertile essence carried millions and millions of sperm cells, fertile and healthy and all seeking the faint chemical trails put off by his bitch's ova to lead the sperm right to them.
Companions Ch. 39
When the mare came into season with a ripened egg, the only sperm cell it would ever recognize as friend rather than foe was that of the bond mate.
Room For More
Dozens of sperm cells had already reached her waiting egg, their heads desperately trying to push, push into it. trying to fuse. time was of the essence! they had one goal. one purpose.
Chapter 5 - The Fated Rematch! Shocking Interference and the Blowout Teammate! (Part 1)
It was full of high tech machines, all used for the sole purpose of semen synthesizing and replication of d.n.a. from sperm cells. all nonsense which she didn't care about, as she was only there to give her "friend" what she wanted.
New Arrivals - Ch1
And as they slept, new life was beginning to form inside mimi's womb as one of fox's sperm cells joined with one of her ovums. ...
Grant's Rampage 1.6
It looked like some sort of enlarged sperm cell! its head was about the size of a car with its tail thrashing wildly in his semen. then, a thick, black hand erupted from the head of the sperm, ripping open the white bulb.
STARGAZER: First Ground - 06
"and if the sperm cell doesn't liberate that toxin, they know it's female!" darison finished. "that is, at least, the explanation that most scientists believe in. any dragoen would tell you a different story." the cerulean said. "that is..."