billy is from california,,, he’s a stoner. before starcourt it was more recreational, maybe helped him relax and sleep. post s3 is when he uses it medically AND recreationally. i hc his mom as a hippie who prefers natural medicines before pills, something billy inherited. he’d rather smoke than take the list of medicines owens prescribed, only really taking them when he absolutely has to. he lives with the byers after starcourt, him and jonathan 1000% percent smoke or eat edibles together almost every night. before they’re dating, maybe when they’re still talking and getting close, he loses track of time at steve’s house. they smoked together and steve’s high has mostly worn off but billy’s tolerance is low these days so his is still going. his eyes are red and hooded and he’s just. smiling at steve so softly as he talks about fucking. cats or something. billy doesn’t know. stopped listening and started watching him talk. he can’t help himself when he grabs steve’s collar and pulls him close, presses a soft kiss to his lips. his breath tastes his weed but steve doesn’t care. billy pulls away just enough to mumble a “sorry. been wanting to do that.” and steve chuckles, kisses billy’s cheek. later in their relationship, steve will stay awake with billy after they’ve smoked (because steve is also a stoner it’s literally canon “it’s not drugs dad it’s just marijuana” or whatever he said to dustin in starcourt.) presses kisses all over his face and head, plays with his hair, holds him close while billy’s all soft and pliant. too relaxed to fight back. too happy. steve will kiss his droopy eyelids, murmur sweet nothings and billy just. lets him do whatever he wants with a soft, dopey smile on his face and love in his red eyes.