Your personal Tumblr journey starts here
Urgent thing I need to share before my ADHD brain forgets:
Snape survived, but since Voldemort is dead, the Dark Marks are slowly killing all the remaining Death Eaters, something Voldy did as a failsafe. And like, let's take into consideration that Harry is quite literally a War Veteran and has some tremendous PTSD, and he probably doesn't know how to cope, and now starts taking Muggle drugs.
So now we have the slowly-dying-'chemistry' -Professor and the horrible-at-'chemistry' -ex-student-now-junky.
The motive for Snape to start making that stuff is still a bit wonky, but it would probably be to leave something for Hogwarts.. Or for his godson Draco.. Yk,,
Anyhow, let's assume he has a motive to do this for now. Maybe he wanted to visit Harry for old times sake, since yk their history and all, and he ends up discovering that Harry became an addict to a Muggle drug.
You know the drill. Lots of discouragement and fighting, until Snape, who is admittedly a bit impressed that Harry was able to make that stuff in the first place, gives in and makes a magical equivalent. Now, that's where the whole fun begins.
I didn't even think about it until now, but it would 100% result in Severitus.
I'm just imagining the two of them sitting in an old Muggle Camper-van, Snape with a cauldron instead of Muggle chemistry equipment, complaining about the size of the thing when it could be magically enhanced, Harry, who keeps telling him that it's more convenient that way in case someone's after them so they'll reach the steering wheel faster.. And the best part is the magical elements in this story. Police AND Aurors would be after them, Kingpins like Tuco Salamanca or Gus Fring could also be Wizards (Gus as a Wizard would GENUINELY be terrifying.), and the whole thing overall would be so much more exciting.
The Weasleys would 100% help Harry sell the stuff.
Anyhow, this concludes this madness for now.