I recommend here only fanfics that have G (general) or T (teen and up) rating, but fic's author can change it anytime, so before reading check the rating and tags of the fic.
Also remember that billford is an abusive relationship so abuse is a common topic in these.
(Honk shoo) Dormi-mi-mi-mi (Keepit6feetunder)
Only You (corndog_patrol)
Shrimp Colors (PerpetuallyLate1890)
Karaoke Night (trianglefan)
A promise and a threat (Clarisimart)
If you want to see my recommendations for mature, explicit and not rated fanfics look here: adult zone.