Nyctophobia
Although Jason will never admit it out loud, he's absolutely terrified of the dark. He tries to hide it best he can. But Bruce figures it out soon enough. Jason never let's Bruce fuck him without the light on and he can't fall asleep with the light off. It's not so much that Jason is afraid of the dark itself so much as the things that can happen in the dark.
In the dark Jason can't see Bruce's face he can't tell whether or not Bruce is Bruce. And he knows that it is Bruce in his head but his body doesn't know that. Someone is touching him in the dark and he knows it's Bruce there's no one else that touches Jason the way he does. It's all soft and slow and sweet and gentle but hard at the same time, like Bruce.
And Jason knows that there's nothing coming for him in the dark, he knows that there's no such thing as monsters-
Except for the ones that looked normal. They ate coffee and went to work, they waved hello and fucking smiled at you like they were normal too. But Jason could tell their auras were black and when they smiled at him he could tell what they were. They looked so fucking normal but once they got you alone they became these monsters. They bent you and broke you made you cry and bleed and beg and were never satisfied, they always wanted more. And they'd keep coming back until you had nothing left to give until you were nothing.
Jason knows there aren't monsters coming for him and he knows its Bruce next to him. He knows all this but it doesn't stop the dread from pooling at the pit of his stomach whenever the lights go out at night.
A/N: This is set somewhere in the near future of my hooker!jason au when Bruce and Jason start boinking each other. I'm not even sure where the inspiration for this fic came but nonetheless here it is before you in all it's angsty glory.