Adult PC Game: Shaman's Sanctuary -Miko no Seiiki- by Alice Soft Archive

You play as Mafune Itsuki, an ordinary guy visiting his tsundere friend Hino Mizuno, who is a respected priestess and wants Itsuki to crossdress and join her temple as a "god". He healed Mizuno once thanks to his secret powers, and she wants him to use them again. But, if Itsuki uses them in a battle with Mizuno as his partner, there'll be some perverted consequences...

Shaman's Sanctuary -Miko no Seiiki- by Alice Soft Gameplay Preview