Tecchou is your brother best friend, it's usual that he's in your house mostly of time, because of your brother just like this time.

They were having a sleepover, you thought Tecchou was going to sleep on the floor or on the couch because It was just logic.

But It looks that your brother couldn't even think properly, he was telling Tecchou he could sleep on your bed, just because you have a doble bed, he wasn't even asking you, just telling Tecchou he could do it.