I'm foul for this one but you guys keep leaving me unsupervised at night so really, it's really your faults
I'm pretty sure kinks are usually related to trauma people had growing up so James didn't really have any until Regulus. I mean, again, James has a good life at home.
But he's also keen to let Regulus hit him if it makes reg feel better.
Also kind of keen for it in bed but on a different scale, you know?
James *do anything you want to me, Regulus Arcturus Black, your hot like please step on me* PotterAlso, common occurrence for this interaction
James: *passing reg in the hall*
Reg: fuck you, Potter
James: love you too