i like the idea of bitten spidershin x spidersuit seba so:
shins got his powers the same way he got his telepathy so asakura and the scientists know as well as sakamoto and lu.
theres def data on him and their observations on shin at one of their databanks and if it were ever to be hacked, they could get to the identity prettyyy fast
Seba does a bunch of shady freelance jobs he does to save up and get mafuyu out of their parents home. He is also an engineering student at a tech school and lives at the their dorms (his parents wanted him in med but the stipend he applied for in secret was able to change their mind)
in this au seba also has an invisibility suit and bc of the nature of the job shin gets in his way all the time, especially w his spider senses detecting seba anyway
in retaliation seba develops his own spider suit based on studying and mimicking the hell out of spidershin clips and whatnot (others would call him an obsessive fan, he thinks its knowing the enemy)
and before shin knows it hes getting attacked and defeated by a different spiderman??
As if it wasnt bad enough he actually gets to hack into the labs databank and gets into shins real identity to blackmail him and leave him alone
shin is stubborn as shit tho so that plan doesnt quite work out as it should
shin keeps following seba anyway and ends up saving his life after he triggers some trap
vice versa shin sometimes picks up random gadgets he used against shin that are still usable and those help him w other enemies too
this is all from my brain but they end up working tgtr and growing closer and seba still needs to pretend like he doesnt know that the store clerk he thought was cute is his fucking nuisance of a nemesis
the sakamotos own a cafe instead and sebas a regular cause its close none of them ever question or refuse his order, just give him a questioning look but do it anyways
shin and lu only remember him as the espresso cryptid cause the amount he takes in is concerning and theres no way hes human w how much hes taking in
the sakamotos and lus past is kind of abt the same except they actually get to live on peacefully after quitting the world of killing except its just regular assassin stuff, no order and jcc or whatever
shin used his heightend senses and stuff to be an assassin too but decided to try playing hero for hana. since sakamoto is aware he just lets him work parttime, cause a safer city for his family is always good