Cute and sappy idea that I want to write into a proper one shot some day whenever my motivation gets going again. More OC X Canon stuff!
Demina won a Fizz plushie at the park and so then Fizz wanted one of her too, so he watches videos on how to make a plush from scratch and starts working on it whenever she's not around so that it can be a surprise. He figures it can't be too hard, he's a robot so he should be good at this kind of stuff right? Until it takes him an ungodly amount of time between watching tutorials and having to take off his wrist cuffs after accidentally sewing things to them more times than he bothered to count.
Eventually he's almost done with it but Demina doesn't need to go anywhere that day, so he makes up an excuse like he forgot to recharge and he's gonna go "sleep" in their bedroom, she knows that sounds really off and kinda fishy but doesn't argue over it. So Fizz just huddles down in the bedroom to finish sewing everything together, but he jumps when he hears the door open.
(He also had the sewing needle in his mouth while struggling to attach something, and when he jumped he stabbed poked his tongue and yelped, of course it had to be one of the only sensitive parts on his body.)
He tries to hide what he's doing but knows he's essentially caught and just sheepishly holds up the unfinished and sorta derpy looking plush, Demina is completely thrilled over it though and gushes how cute it is after she asks if he really made it himself.
So they sit together and Demina helps to finish it, of course she immediately poked herself with the needle and Fizz laughed at her, but only because he knows that would have been him at least a hundred times. She's only slightly annoyed but he's really good at getting away with that by grabbing her hand and kissing her finger before they continue.
Once the plush is done, they're both really happy with it and it gets put on top of a dresser holding hands with the Fizz doll.