I wouldn't worry about it too much. I've got my cats in "pairs" with about a month in between the two (Snickers & Peanut). For that month, Peanut was attached to me like a little piece of velcro, then Snickers came along and off they went - snuggling, licking each other, etc. I was worried too, but now - sometimes they both sleep with me, sometimes only one. One cuddles with me in the kitchen, then the other in the bathroom, yet every now and then they will lay down together and snuggle with each other.
I wouldn't worry about it - you'll still be a huge part of their little "click"
(and believe me - there will be times when you wish they would go off and snuggle somewhere and just leave you alone - especially at 5am