Male Cat Aggression

Question
Hi!  I adopted 2 darling male tabby kittens (litter mates) in December from a rescue shelter.  They've been so fun to watch grow and interact.  They were initially very shy and skittish but with time have become more friendly. They are quite identical except in size.  Jamey is larger, more cautious, and definitely the alpha male.  Joey is small, curious, friendlier, and omega.  My concern is this:  I often see Jamey mounting Joey, biting into his neck and making a whining sound.  I assume this is dominant behavior but I'm not sure it's something I should tolerate.  Should I discourage this?  And, how, by separating them for a time?  Joey doesn't seem to mind but he looks so victimized! Advice, please?

Answer
Hi Karen,
Happy to hear they blossomed. are they both neutered? Often this is mating behavior or part of a dynamic. not, that would be the first step. You can redirect his attention when Jamey is getting into position but it sounds like it falls into the category of normal adolscent behavior. Redirect with a game or toy but it is all about timing. Adolescent boys are particularly rambunctious so expect a lot of tumbling. This will calm down as they get older.
I don't know how often it is happening as that wasn't clear but be sure they have adequate stimulation, exercise, climbing cat trees and fun games. Play with them with want toys and keep them mentally stimulated.
Best,
Shanti