Supernatural: Dean/Sam.
Set after Dead Man’s Blood there’s a lot of nice brotherly one-upmanship and some smokin hot sex, all with Papa Winchester in the next room. Bringing a whole new level of kink to the whole Wincest thing.
Romance Goes Out the Window With Dad in the Next Room and sequel And a Little Angst Flies in the Window of the Impala With Dad a Half Mile Up the Road