The 3rd story is definitely this one:
The Light at the End by LikeABlueThread Reviews
In contemporary Tokyo, where demons are stigmatized and must hide their identities, two lonely souls find each other on a train. MA for explicit sex. NOW COMPLETE!
Rating: MA - Universe: Alternate - Status: Complete - Category: Chapter Stories - Genre: Friendship, Romance - Updated: 05-24-12 - Created: 05-18-12 Chapters: 12 - Reviews: 117 - Words: 44,371 - Reads: 88,539 - Anonymous Reading: Yes
www.dokuga.com/fanfiction/story/7374/1
Not sure about the others, sorry.