Your dream or mine? (Undertaker x reader) (black butler / kuroshitsuji) (lemon)

When solving a strange murder case, dreams can become so very bizarre.......but is it your dream, or mine?...

Black Butler characters and reader (Y/N) working together to slove an odd case, using strange methods to do so and getting her in a spot of trouble with an old friend in the process. (Set in Modern-day London) (first person/ reader insert)
Warning: Does have some adult content.