Imagine Person A of your OTP having a lot of tattoos across their body. Person A and B are in bed for the first time, and A usually wears tunics and long pants to cover up the tattoos because they’re nervous of what B will think of them. When they’re both naked, Person B stops to admire the tattoos, running their lips along each and every one of them.
Imagine Person B of your OTP getting a pet for Person A, but soon became jealous of the pet for getting so much of Person A’s attention.
Imagine you OTP having their first child. Person B stays up all night making sure their child is sleeping, and also holds the baby all day. After a while, person A convinces person B to let the baby sleep in the crib and finally get a good night’s sleep.
Imagine your OTP about to say goodbye to each other. Then Person A attempts to hug Person B and Person B attempts to hug A back but ends up failing and making it awkward. Person B is embarrassed but Person A laughs it off and pulls Person B into a hug and kisses the top of B’s head.
Imagine person B of your OTP waking up on the couch from a hangover. As they wake up, they see person A in the kitchen making them a cup of coffee (or anything that might help with treating their pain). Person B feels guilty about having person A worry about them after leaving last night and therefore apologizes. Person A immediately accepts their apology, and they embrace each other before spending the rest of the day together.
Imagine your OTP arguing over which of them is taller.
Imagine that your OTP felt that they’re at the end of their relationship, but wants to end in a spectacular note. They decided to host a break-up party. At the end of the party, they decided to have one last goodbye kiss, for old-time’s sake.
Imagine your OTP getting a divorce. Person A tells Person B that they wish the two can become friends again.