your mom married a billionaire and the billionaires son is now your stepbrother

"Welcome to your new house! And by the way this is Clarkson your stepbrother" your stepfather says

Clarkson only glared at you scanning you up and down and left

after, you were in your room laying on the bed suddenly you realized you forgot to brush your teeth. As you went to the bathroom you saw Clarkson bathing. Only glaring at you but after he drags you in the bath tub

"Join me." he says coldly