Series: Touhou - The phantom sea in my dreams (Azuma Aya)

Artist: Azuma Aya
Original title: ゆめうつつの海 (Yume utsutsu no umi)
Gallery: https://e-hentai.org/g/1928460/26c11eeabd/
Pairing: Reimu x Marisa (ReiMari)