[Noujiru Teishokuya] Reincarnated as a Futanari Horse First Part

A girl reincarnates into a fantasy world as a futanari unicorn, complete with a massive veiny shaft and sheath she can barely comprehend, let alone control. A teasing elf who admits she's been holding herself back with magic finally drops the act, kneeling beneath her new mount to inspect every pulsing inch and wonder aloud just how much sperm she can produce, then offering an eyeful of her own dripping pussy by way of invitation. Between the elf's seduction and a very interested stallion staring at her endowment, the flustered horse-girl starts to suspect that losing her virginity to another horse is exactly what this second life has planned for her.