Imagine Person A of your OTP being insecure about some aspect of their appearance. They keep it to themselves, but Person B is aware of it. B still thinks A is beautiful/handsome/sexy as hell, and takes the opportunity to tell them as much whenever they feel that A needs to be reminded of it.
Again, if you guys haven’t heard of the movie “Weekend at Bernie’s,” it’s basically about this rich guy, Bernie, who gets murdered and these two stupid boys throw a party at Bernie’s house and drag him around like a rag doll with sunglasses. No one even notices he’s dead.