Lolokemo Nikki ~Inu H Daisuki ○ Gakusei ga Roshutsu ni Mezameta Natsu~

Carura [...] was a schoolgirl who loved a dog inside of her.
The first day of summer vacation she instantly thrust her fanny in the air and masturbated both her holes like crazy, then her black lab mounted and fucked her tiny hole with its warped veiny dick.
She had sex in the dog shed, on display for the world to see.
It only got more daring: sex on the public bus, by a picnic river, raped by the big dog at her friend's house, gangraped by three animals taken for a walk.

[Edited from DLsite English]