I can see Craig and Stan having a sort of friendship with some feelings. They'd never be in a relationship but they enjoy making out, getting drunk and playing videogames. Mostly videogames tho.
honestly that sounds like a good time stans a slut for getting drunk and playing video games and im a slut for shipping him with muses like craig
as for the not actual dating part he’d probably be all about that for awhile like have it as a dirty lil secret between them
but eventually he’d wanna settle down w craig cause like??? he’d be more attached as time goes by and start to think craigs either stringing him along or just using him and end up getting hurt over it and then be like “fuck him”