Dam right,Cas

A love born out of free will

That was never part of a plan

Through realms and realities

Between an angel and a man

Did your heart just beat real fast?

When you only thought of Cas?

Did your heart just have a blast?

'Cause you are in love with Cas?

📈📈📈📈📈

...

You know what's beautiful about beating hearts? Not only do they mean life. They also mean emotions. And in this case here, it means love.

In 15x10 (The Heroes' Journey), near the end of the episode, when we get the "babyCas stares at me wierd" joke, we also get "told" something else...

We know that werewolves can hear hearts. In 9x12 (Sharp teeth) (when we learn that Garth became a werewolf and dates one named Bess) Dean is sneaking up on a werewolf (Reverend Jim Myers - Bess's dad).

Reverend Myers tells Dean he can hear his heartbeat. He can tell Dean gets nervous. So,all that because of his heartbeat. Ok, so far so good.

So.

Dean is holding babyCas and mentions to Sam (who is holding babySam) that "this Cas keeps looking at me wierd", whereas Sam replies "so kinda like the real Cas".

And that was a nice joke commenting on Cas being extra and all. (But there's more to it) .

Then babyCas's eyes glow werewolf style, which freaks Dean out and he gives him back to Bess.

Sooooo...

Why did that happen & why did only BabyCas's eyes glow and not babySam's?

The answer :

Because Dean is in love with his angel Cas !!!

Being/Falling in love makes your heart beat faster. A quick Google-search points you to a number of related articles.

...

.......

Yes 📬 ...

Off camera -> Dean is holding the baby (nothing to be scared off), probably thinks 'lol this kid is named Castiel/Cas just like Cas', his heart goes tictic a little bit faster ( 'cause he thinks of his Cas), the baby picks up on that new heartbeat rate, starts looking at Dean...

Then - the scene opens with babyCas starring & Dean saying "baby looks at me wierd".

Sam comments how our Cas looks at Dean wierd too, Dean probably pictures Cas & himself looking deeply in each others eyes, so i guess, his heart goes full tactac, and the little werewolf goes "Hungry!...eat heart 🍽" - 'cause his mini werewolf instincts get activated (probably due to his close proximity to Dean in comparison to his twin brother as they are babies and still growing unlike their grandpa who heard Dean's heart across the room).

That episode gave us why lamp,but it also gave us why glowy eyes 👁 .

😆

And noooo, the babies did not react to Bess saying the grill cheese sandwiches were packed. BabyCas was already starring at Dean.

And no diaper mess either.

Sooo.

Dabb confirmed Dean's romantic feelings for Cas in a sneaky non-verbal way, an episode after the Purgatory prayer (15x09)

9x12 (written by Adam Glass) aired (1/28/2014) almost exactly 6 years before 15x10 (written by Andrew Dabb) (1/23/2020)...just a little fun fact.

Both episodes were directed by John Showalter.

....

Garth smiles at Dean getting all spooked out (Dean was shown to not be nervous up to that point), Sam sees it too, says "yeah, we better go" and hands babySam over to Bess.

Side-question ... Did Sam notice 👀 ? ( * i whisper: Yes? (Hm not sure, always go back & forth with that)

...

Thanks for reading dear Reader. May you never be exposed by a babyWerewolf.