Sinkdog is Mattie's sink and Mattie doesn't know that that's weird for a kitchen.
A central concept of Mattie is that he is ontologically immune to kink logic. He meets sinkdog, he washes the dishes. He meets an inflatable rubber cat? He's relaxing by the pool with a mint julep. Dronification cybernetic fox? Mattie is microwaving a burrito in them. Scary serial murderer gore OC? Mattie turns it into Tom and Jerry logic.
If you give Mattie a glowing pink potion with heart shaped smoke coming out the top, he chugs it, the laws of the universe will bend to to keep Mattie from drinking it. A barfight will begin, and Mattie will smash it on the table to use as a weapon. A comical mixup will result in someone else drinking it. Or the spilled liquid will feminize some poor bystanders mouse fursona hanging out under the table.
In my mind, you can stick a bike pump into Mattie and inflate him, UNLESS that turns you on. If that would make you horny, he has an embolism and you have to call 911. For this reason, Mattie is Ontologically bad at sex.
To mattie, getting hit with a fetish scenario is like getting a haircut. If you show up at work the next day 400 pounds heavier bc you did some feederism shit over the weekend, Mattie just politely doesn't acknowledge it until you bring it up first.
"You didn't mention that my muscles are the size of train cars."
"Dahling I can't keep up with the fashion these days but it never hurts to be polite. Would you mind squeezing this lemon into my drink with your massive fingers?"
"of course."
"Thank you dahling."
Crucially, it can NEVER work in his favor. If Mattie tried to hit HIMSELF with a big mallet to slide through a mail slot, he would have a seizure and and up in the hospital with cerebral hemmoraging. Mattie is not genre savvy. He is not anything savy. He is an idiot.
I think he CAN succumb to kink scenarios but only if they're overruled by comedy. Like he can get boned by a tentacle monster, but he nuts after like 30 seconds, and the tentacle monster like, comically crosses its multiple arms and sighs. A dom can whip him, but Mel Blanc screaming is involved. You get the picture.
