It’s Spencer’s favourite holiday, Penelope enjoys it and Derek goes with it because he loves his partners.
Group costumes every year, the two highlights being the year they went as a football player, ref, and cheerleader.
And the year they did a group costume with Emily & JJ as the Scooby-Doo crew.
Derek is forced to help decorate that outside of the house (but not to scary because they don’t want to scare the young kiddos on their block - Penelope).
Penelope cautiously does makeup on Spencer, textures are difficult with him and Derek is there prepared to immediately wipe off something he reacts adversely too.
Spencer likes carving Jack-o-lanterns but will cry if his hands touch pumpkin guts, Penelope gets him special gloves and removes the pumpkin guts herself (Derek follows her around cleaning up with mess with an exasperated smile)
Spencer & Penelope get overly excited about handing candy out to kids and sit on their step all night, Derek sits back on the porch stairs and watches smiling apologetically at parents when they dump handfuls of candy into kids bags.
They drink hot apple cider all night.
When the curfew for kids collecting candy hits they go back inside to watch Halloween movies.
It starts with horror movies, moves to horror movies while cuddling obscenely close to Derek and holding hands, and ends with children’s Halloween movies.
They all curl up in bed together at the end of the night in themed pyjamas, Spencer tells spooky stories from memory.
By the end of the night they’re all out cold cuddled close together (night light and bathroom light on).