Vampire!Robby and Werewolf!Abbot taking the shifts that don't suit their supernatural sides at all. Robby taking the day shift (when he should be asleep) and Jack taking the night shift (when he should be free to transform) and maybe it's like a kind of self-flagellation but also they just hate having time to think for too long. So they stick to the unhealthy patterns.
Jack teasing Robby about his blood-drinking. Like nudge nudge, "I heard the bagged shit tastes like crap." and "In the army I saw a guy collapse because he was too busy working himself to the bone to realise he hadn't eaten." and working up to "Y'know, if you ever need a friend to help you out..." He's a little, tiny bit obsessed with the idea of it. On the outside he looks like a war-torn old dog, but Robby knows he's just an excitable puppy really- once he sinks his teeth into an idea, he just won't let it go.
Robby ordering Jack to go home when he's working a shift way too close to the full moon. Jack getting pissy and confrontational about it, shoving and growling until Robby yanks him away into a spare room and gives him a very, very specific brand of hard look.
An emergency on shift leading to day shift working overtime. Robby doesn't even realise how hungry he is until he's grabbing Abbot by the arm and pushing him into the supply closet, quiet and demanding- all instinct driven and starving. Jack blushing and remembering all those times he gave his explicit permission for this to happen, all those times Robby rolled his eyes and turned him down with a grin. All that now coming to a head with Jack's throat on display, Robby pressing his thumb against the pulse-point then leaning forwards to breathe over it before he bites down. Jack trying not to make too much sound and not to pop a boner against his friend's hip. Walking out after an embarrassed Robby with a hickey screaming out for attention on his pale neck, two pin pricks pointing to the culprit.
Etc, etc...
