he had just lied to his mother, gotten on a train, got chased by a dog and got lost. he came back to the hotel, but he too scared to face his mother, so he went into your house instead. he knocked on your door, you opened the door.

"what happened!?" you asked

"stuff. could i come in?" sheldon replied, you did.

you helped him get clean. after that, he explained how he had gotten into this situation.

"so.. i need you to come up with a solid alibi as to where i was." sheldon finished.