Its Shin's erogenous zone.
It turns Shin on so it's more like Shin has the kink.
Yes. If Shin didn’t keep responding to it the way he does, Jake wouldn’t keep doing it. But Jake does have a kind of an unusual kink- he likes sniffing Shin when he has the odor of motor oil and gasoline on him from working on cars.
What can we say girl ╮(￣▽￣)╭
I don't mind them getting freaky (▰˘◡˘▰)
Jake definitely has some sort of armpit kink every time they do it hes leaving hickeys or just sucking away at it