This used to be posted on Gurochan: Neutered by the Vet – climax.
Hot scene, it’s given me many orgasms. You can buy the eBook on Amazon. It’s well worth it. I have no connection to the author(s) of this book.
And here is a foreshadowing excerpt, which is very erotic as well.
Found this online. I believe the effect is called irising.
My first commission with Sorenutz. I’ll have to add up the dollar amount some day. Please note: the difference in body size is due to the Amazon/Giantess fantasy element. All characters are adults.