I’m late to the “only straights ship Karamel” party, but let me tell you something.
I’m probably aro/ace and I don’t ship easily. I have like 10 ships I absolutely adore, some I like and freaking gazillion of NOTPs. I can easily find problematic traits in every ship. I’m the first to point them out. I prefer friendships and platonic relationships over romantic things. Like, ugh, give me a real friendship and brotop and I’ll squeal like a happy pig. Romance? MEH. I’ll roll my eyes so hard that I’ll see the insides of my skull.
The point is, when I ship the couple has to be, at least for my standards, extraordinary. Karamel? Holy shit, my asexual ass will happily sink with this ship and nothing is going to stop it.