Izayoi ~Hime Miko Senka~

Main character is a young man who lives in the mountains as a hermit. One day two girls lost their way and got to hero's house. They insisted that they did not want to go home, and so they stayed in the mountains. On the night of that day main character felt a strange hypnotic impulse in his body and incredible lust force awakened in him.

[From vndbreview]