Yamakono Mura - Kichiku Murabito to Nagusami no Miko

Where every night, shrine maidens are ravished by the locals...

The protagonist is a teacher on dispatch to rural Yamakono Mura,
where he gets to know two loli students: Miyako and Haru.
To his great surprise, he sees Miyako f*cking the villagers at the local shrine.
It's a debauched festival that continues until dawn.
As for Haru, she calls her pornographic trysts "dates", and has one
with the protagonist. They carry on this way for days...

Who will the protagonist choose?

[From DLsite English]