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Sam and Cas had always made sure they kept Jacks night routine and Dean very seperate. Well, they kept most things including Jack seperate from Dean.
Tonight was different. Dean had been... intrigued. He'd been watching from afar a little more, even dished Jack up some ice cream a few days ago.
But this? This was new territory. This was something they didnt want to share. Not with anyone, and especially not Dean.
Still, he brushed his teeth in the bathroom with them, and followed them into the library, into Jack's nook. Fluffy carpet, rocking chair, childrens books and apparel galore.
He'd only reacted slightly at Sam's nightgown - before, even after transitioning, she wore pants and a tee to bed. All in all, Dean thought he was doing pretty good.
Sam settled in the rocking chair, plush and patterned in blues, tilting herself back once.
Castiel helped Jack pick a book, socked feet shuffling as he worked through them, thumb in his mouth and eyes tired.
He picks the book up, holding it against his chest.
"Mommy?" He whined, Cas bringing him closer, Sam hesitating as she watched Dean,
"Mama?" Jack tried again, hand on the arm of the chair.
"Come here," Sam soothed, pulling her attention from Dean and guiding her baby onto her lap, nestled in the chair.
She opened the book, kiss pressed to Jack's forehead, Cas settling on the couch, next to Dean. Jack kicked one foot, pushing his chin forward, "Mommy,"
"I know," She sighed, taking one more fleeting glance at her brother before maneuvering her night dress. Jack was helping himself before she was fully exposed, saving her the humiliation of being seen by someone other than her partner.
They both sighed, relaxed, as Dean sputtered.
"What?"
"Its very normal for infants to be nursed to sleep." Castiel informs, almost-glare keeping Dean in place,
"He's not an infant dude!"
"In fact, breastfeeding a child is considered normal up until the age of seven." Cas continues, "Jack is only a few months old, though."
Sam, for the most part, was trying to block them out as she read her story. It was the baby book, as Jack put it. Honestly, she didnt know why they even had him choose anymore. It was always this book.
He was exhausted, as expected, and dropped off within minutes, lazily suckling still.
"What the hell?" Dean finally continues, hushed.
"Its not abnormal for-"
"I know. Breastfeeding." Dean waves his angel friend off, "How the hell did..." He trailed off, "Why are you, uh, why are you," He waved his hand some, cheeks pinking, "Milky?"
"Milky." Sam deadpanned, "Why am I milky?" She's got that bitchface, which helps the tension. Some normality.
"Sorry Sammy but you dont..." He trailed off, "Little dude didnt come out of your body. You gotta have a baby for that stuff, right?"
"Lactation," Sam starts, "Can be brought on by many things. Medication for one. Hormones." She shrugs, "But, uh," She glances down at Jack, "Just kinda happened. When you were grieving mom, and Cas and I were looking for him, he kind of... latched on. Figuratively and literally."
"Do you even know how we became his parents?" Castiel asked, deadpan. Jack was out, no use being quiet.
"I just kinda assumed you told him you were?"
"No." He sighed, "Kelly told Jack I was his father in the womb. What was Lucifer was changed, so to speak. He absorbed my grace - miniscule amounts," He rushed, "But he absorbed it through her skin. He isnt Lucifers child. Not really."
"But," Sam continues, "The trace of Lucifer was still there. You know, base component." She shifts her arm, moves Jack closer, "And, because I'd been around Lucifer - before Jack was born, just before, my... connection to him was heightened. The residual grace was awoken."
"So when Jack was born," Cas takes over again, hand reaching across, fussing his boys hair, "And we found him, he sensed my grace, labelled me his father as Kelly intended. But the residual grace in Jack reacted to the residual grace in Sam."
"And... what? He thought you were Lucifer?"
"No." Sam closed her eyes, "He made the connection. If we're both connected to him, and Cas is daddy, that made me mommy. He sort of... confirmed his theory when he realised I was human. He knows his father is an angel and his mother is a human."
Dean nodded, "Sorry, how does this equate to you being all... boob feeder?"
"Dude." A heaved sigh, "Breastfeeding. Nurser. I'm not a boob feeder."
Dean shrugged, "Well?"
"Angels nurse. As fledglings, we nursed on our siblings, the older ones on our father." Castiel explains, "Its natural a creature half angel would expect to be nursed. I fully expected to nurse him, and I do occasionally," A slightly horrified look from Dean,
"But the human part of his brain knew that mothers breastfeed, not fathers. So his grace sort of... influenced it. I believe Lucifers grace in Sam had something to do with it, too."
Dean drops his head back, eyes closed, "This is weird,"
"I didnt want you to watch."
"Well..." He shrugged, "Its fine. I'm not..."
"Not?"
"I'm not mad. Or upset. Or even grossed out, really." He opened his eyes again, "It makes sense, I guess. I remember mom feeding you. And me, a bit,"
"Infants cant remember nursing." Castiel informs,
"She, uh, nursed me til Sammy came along. I think even a little bit when he was a baby, too."
"Then why were you grossed out?" Sam exclaims, exhausted.
"I wasnt! I just didnt expect you to pop a tit!"
"I'm going to bed," She groans, "Cas?"
Castiel lifts Jack from her, and they make it back to their room, "We'll see you tomorrow, Dean."
"Yeah," He nods, deep im thought, "Tomorrow."
Truthfully, he didnt know what he was feeling. Not really.
Well, he knew a bit. Jealousy, at least.
Why? He wasnt completely sure.