Alright brain, I'll resign to my fate
About the Guy x Leon x Velzard thing
First, how did the idea get stuck in my head?
Well Veldora has his nerdy, dumbass (affectionately) otherworldler, whether you ship them or not
Velgrynd has her nerdy, dumbass (affectionately) otherworldler
So where is Velzard's nerdy, dumbass (affectionately) otherworldler?
And then it struck me... Leon xD and the way they are so nonchalantly passive aggressive towards each other in that one scene :D and judging from Guy's reaction (I'm talking LN Vol. 6 btw) it isn't even uncommon behaviour for them
But I'm a GuyLeo truther... Yet... Leon has two hands ( ꈍᴗꈍ)
Second, this thought came to me this morning
Why can I just see Veldora immediately starting to panic the moment Leon is visiting Tempest and he notices a lot more of Velzard's magicules on him than should be normal, even if they sometimes interact? Like the amount that should be there if either Velzard has done something horrible to him or they're lovers? And they can't be lovers, because Leon seems too reasonable for that, so she must have done something horrible to him.
What else could it be, really? But Leon seems fine and Rimuru isn't doing anything. Why isn't Rimuru doing anything? Surely his sister has done something. And Leon and Rimuru are somewhat friends. And while Leon is a reasonable man, he'd deny everything, if anyone asked. Too reasonable to be having something going on with his demon of a sister though.
And thus starting to try and figure out what exactly she did, so he can alert Rimuru. Much to everyone's confusion. And Guy's amusement, because of course Veldora would get Ramiris to question Guy.
And last (half baked) thought or rather image I can't get rid of:
Velzard wearing Leon's shirt, only his shirt
a) she stays in one room (preferably the bedroom) -> huge turn on
b) she walks around -> Leon (utterly embarrassed) quickly scoops her up bridal style (if Guy doesn't find her before that) and carries her somewhere else (preferably the bedroom) much to Velzard's delight