One of my favourite crossfangs ideas is an au where they're extremely inconvenient soulmates that feel each other's pain. Because as a vampire, Scott is capable of taking and healing from massive amounts of trauma, he can handle the pain quite well when it doesn't last long, it's just a minor nuisance to him at this point, but Abolish's human nervous system is not used to being overloaded with so much intense information.
On the other hand, Abolish is used to lingering pain, to his body needing time to heal even the smallest injuries. He knows what bruises feel like, he can easily ignore how his ribs ache, how a papercut keeps stinging, or how his head throbs. Meanwhile, Scott hasn't had a headache in centuries, the worst he's had to deal with on a semi-permanent basis is getting sunburned, and that's over as soon as he's out of the sun, so being soulmates with a fragile, slow healing human is, not to be dramatic, the worst thing that has happened to him in centuries.
Abolish would definitely be the first one to consider that he might have a soulmate when Scott goes to stage 2 and his skin starts to hurt at random times. But he won't realise that his soulmate might be a vampire & could be in Oakhurst until Apo takes an axe to Scott's throat and Abolish almost blacks out from the sudden onslaught of pain that disappears almost as quickly as it came.
