Rose continued walking, but Cassandra didn't. "Why are you still there?" Cassandra's grin widened and a pink mist escaped from her mouth. Rose tried to run but was not fast enough as the mist entered her own mouth. Rose, or should I say Cassandra, stumbled a bit but stood up again, walking toward hers and the Doctor's room.
"What did they want?" The Doctor stood up to greet Rose. "Huh? Oh...umm...nothing!" The Doctor eyed her suspiciously, but ignored it. "So..." but he was cut off by a pair of lips on his. This confirmed his suspicions. Rose pulled away and the Doctor wiped his mouth. "Cassandra. Leave her alone." Cassandra's smirk faded and she frowned. "Do we have to go through with this again?" The Doctor held up the sonic screwdriver in reply and Cassandra sighed. "Fine then, but don't get angry at me." The familiar pink mist floated through a gap in Rose's lips, and fought its way into the Doctor. "Doctor?" The Doctor blinked. "Well, here we go again. Manville." Rose scowled. "Get out of him Cassandra." Cassandra sighed. "I told you, he tells me off for being in you, and you tell me off for being in him! I can't win either way. Unless..." Cassandra grinned an evil grin, and breathed out a mist, this time it was a golden colour. The next thing Rose knew, all her thoughts were intertwined with the Doctors. "Cassandra, what have you done?" The grin vanished. "I've simply put the Doctor's soul into your body along with yours." Rose started to panic. What if he could see everything? Her secrets and her...feelings. She continued to panic until she heard the Doctor's voice in her head. "Rose, I won't read your thoughts unless you want me to. I'm not Cassandra." Rose smiled inwardly. Cassandra stood up in the Doctor's body and walked, mincing, into the bathroom. "Let's see what this baby can do!" and before Rose could stop her she'd locked the door and Rose couldn't get in without the sonic screwdriver.
Eventually, Rose walked down the halls of the palace to explore. She came across Ivaneto who looked scared to death. "Miss, Miss!" the young boy cried, and threw his arms around her waist. "What is it? What's wrong?" a short moment later, the King came storming down the corridor with a whip in his hand. "Stand aside Rose. He has been bad and will be punished," Rose took hold of the boy, and stepped in front of him. "With that whip? No." the King looked shocked at her outburst, "Rose." He said, sternly. But Rose replied. "Your majesty. From now until me and my," she hesitated, "Husband have gone, this boy will be under our care." In her mind the Doctor congratulated her on a speech well said. "Fine. If that is what you wish." and he turned on his heel, and left.
After the King had gone, Ivaneto looked at Rose with adoring eyes. "Miss, you saved me from his majesty's whip. Thank you very much!" he took hold of her hand as they walked back to the bedroom.
"Cassandra? Are you finished with the Doctor's body?" a slight moan came from the direction of the bathroom. "How I envy Cassandra." thought Rose, completely forgetting that the Doctor could hear her thoughts. "What do you envy? The fact that she's probably masturbating me in there or the fact she's evil?" Rose thanked God that he couldn't see she was going red. "Umm...Don't worry." Ivaneto curled up on the bed and went to sleep. A moment later Rose heard a loud "Oh GOD!" from the bathroom, and shuddered. "I don't want to know what's going on in there." she said out loud, but deep down she thought otherwise.
Short, I know but I ran out of ideas.