Both brothers are tired, worked, stressed, aggravated, etc. They needed a break was afraid of what would happen to Sophia. Cas then offers to baby sit Sophia but Dean isn't so sure.
"Dean, you and Sam should go out for tonight I can watch Sophia for you". Cas said.
"I don't know Cas, what if Sophia needs something". Dean said.
"Dean I'm pretty sure Cas can handle a four year old for an hour two at least". Sam said.
"I will be fine with Sophia, you two need a break go out. I will call if anything goes wrong". Cas said.
Dean then thinks about it and caves in.
"Alright but only for an hour that's it and you call if anything goes wrong". Dean said.
Sophia then comes in the room rubbing her tired eyes ready to go to sleep for the night.
"De, Sammy I weally sleepy". Sophia said in a slur.
Dean then picks her up and rocks her.
"I think it's your bed time then princess". Dean said.
Dean, Sam, Cas then go tuck Sophia into bed for the night.
"Sweet dreams princess". Dean whispered
"Sleep tight sweetie". Sam whispered.
"Good night little one". Cas whispered.
They kiss her head then Sam cuts her night light on then the trio left leaving the door cracked, the brothers then leave the bunker leaving Cas alone with Sophia. It's been a hour and a half since the brothers left and Cas is doing fine so far he decides to go check on Sophia and when he gets to her room to check in on her but his eyes widen because she's gone. Dean is going to kill him. He calls Sam so that way Dean won't be on a bigger war path then he already will be.
-Yeah Cas what's up. Sam answered.
-If I tell you don't get mad in any way possible because Dean is going to kill me. Cas said.
-What's wrong? Is everything ok? Is Sophia alright? Sam asked.
-I went to check on her and she's gone. Cas answered.
-What do you mean she's gone? She's four! How far could a four year old go. Sam said.
Sam was silent for a minute before he said something again.
-Me and Dean are on the way back Cas try to look around for her she couldn't have gotten that far. Sam said.
-Alright. Cas said.
Cas hangs the phone up and begins to look for Sophia but has no luck, not even 10 minutes later a very pissed off Dean comes in with a panicked Sam.
"How do you lose a four year old?" Dean asked.
"I went to check on her and she was gone". Cas said.
They then split up to look for her and Dean finally finds her, the sight swells at his heart. Sophia was curled up on his bed with her thumb in her mouth and her teddy bear tucked to her chest. Sam and Cas find Dean but he signals them to be quiet and to look.
"Why she in here and not her room?" Cas asked.
"If she gets scared or has a nightmare she'll wander off to either mine or Sam's room". Dean said.
Dean then goes to pick her up and she stirs.
"D'n". Sophia slurred.
"Shh go back to sleep sweetheart its alright". Dean whispered.
Sophia then falls back asleep on her brother's shoulder having him, Sam, and Cas to take her back to her room tucking her back in for the night. Cas knows now to check Dean or Sam's room if Sophia goes off.