If Harley and Tether are engaged in the future from what you portrayed in that comic, I need to know what the proposal was like-
Forgive me, my friend but I NEED THE DEETS, Proposal and marriage fluff IS MY KRYPTONITE-
All begin with Tether finally learning how to fly properly, they were too excited to wait for the morning so they wake up Harley on the middle of the night, after a explanation both of them go outside and Tether lost on the moment princess carried Harley to the night sky.
The moon is missing this night so the stars shine bright on the sky, but Harley is speechless for something or for someone else, all the feelings she keep secret from her best friend finally became too much to keep them inside.
Tether notice that Harley was oddly quiet, so they face her friend "Harley are you ok? Sorry if you feeling a little sick I did-" but they are surprisedly shut up by Harley.
The kiss was quick but it contains all the love of the harlequin doll to the overpowered Lego piece.
Harley let out a sigh "haaa~ I did it, I was hoping you would the first to do this to be honest"
Tether face became red with a furious blushing "wa-wa... wait, Ley you feel the same?"
"of course you dummy, I believe I was making myself clear, you are even more dense than your parents, I should have known, coming from them you would never propose"
"Well, of course, are you implying you want us to date first? we already know all about the other, so my beloved fiance you do accept?"
"ye-yes, heck yeah, I mean, I would love too be your fiance, and you to be my bride"
"ummm, I was hoping you would be my bride though"
"I was joking Tete, now let's just enjoy this moment~♡♡"
Well this is the propose, remember that in my Au Zooble and Gangle know each other for years and never date officially, but after they have Tether they give it a try to be together, Soo Tether is equally dense as them.