Ships: Yes, you’re cute. I find you appealing together. I like you. If you break up I will be upset, but with time I will learn to accept the fact that you are no longer a couple. I may even learn to ship the two of you with other people.
Otps: This is it for me. I don’t care who comes into your lives. I don’t care if one of you decides to move to an alien planet and become part of that alien race. One of you dies? How open are the writers to ghost/human sexy-times? You’re it. You’re mine. I want you and only you. Nothing compares to you and nothing ever will. You. Are. It.
Having an OTP is actually a lot like being in love. Having an OTP is being in love with the love of two people.