Well, duh! Because it's mine! Do you think you can just march into someone's house and take a nap on someone else's bed? This isn't a video game!

[ She drags him off of the bed and then immediately sits down on it, crossing her arms into a superlative frown. Turning her nose up at him, she looks like she's saying 'this is mine' with her posture. ]

Now you will apologize formally to me or suffer the consequences! You may address me as Lady Lambdadelta. Normally I wouldn't even give you the chance, but I understand how men can act, and I'll let you atone for your crimes.