You and Yorihime lives on the Moon in moon capital. After events of ,,Silent Sinner in Blue,, she became interested in shrine maiden Reimu Hakurei somehow. It doesn't matter for you, so you continue do your usual things in moon capital. You and Yorihime also have a pet Rei'sen(because past pet Reisen escaped)

though, one day night you open door to her room and saw how she lie in her bed with... Big fumo Reimu and she hugged her tightly

Yorihime:"Reimu..."

she said in sleepy and soft voice, probably she dreams about Reimu in her sleep