Before I trade his ass in for a better model.

Ok, here's the situation. I have this chair. Is it big, pink, and fluffy. Siren has claimed this chair since forever. Normally during the day, there's not much of an issue and Sebastian lets Siren sleep on the chair. At night, however...

This little fuck jumps on top of Siren while she's sleeping because he wants the chair. Then they start cat battling hella hard and there's swatting and growling and hissing and holy shit, it's so loud. They don't stop until either Siren gets off the chair or until I get up from bed and remove Sebastian from it.

I do not enjoy this. How do I get him to fucking STAHP!?