What if Baby Mario Disappeared?

It was a warm summer day in the Mushroom Kingdom when Luigi saw his brother walk up to him with a blanket and two of the biggest plates of spaghetti in all of the Mushroom kingdom. Mario also took out a cupcake and a mini-candle. "Happy birthday, Luigi!" Mario said.

"Aww bro! You shouldn't have!" Luigi exclaimed.

"I didn't make the cupcake. The princess did." Mario confessed. He shuffled on his feet then sat down under the tree next to Luigi. "Also I have to tell you something else."

While Mario was talking, Luigi had started to stuff his face with spaghetti. "What?" He said through a mouthful of spaghetti.

"It's about Baby Mario."

"What about him?" Luigi put down his plate and Mario noticed the plate was completely clean.

"H-he disappeared last night. I got the letter today." Mario sighed.

Luigi looked at his brother. "Anything else?" The plumber in green asked.

Mario replied with a shake of his head. "On the bright side, someone sent you a letter."

Luigi had looked downcast until he heard of a letter. "From who?"

"It looks like 20 people sent you at least one." Mario said, holding up the cards.

"Awesome! It looks like Rosalina sent me one! How did she manage it?" Luigi asked, picking out the card from the stellar princess:

Dear Luigi,

Happy birthday! I am sorry I am not there to celebrate it with you. Right now, I am traveling over a planet known as Mobius. Well, I wish you a very happy birthday.

Love,

Rosalina

PS. Here are some starbits for you and your brother Mario.

"That was very nice of her." A high voice sounded behind Luigi.