Another prompt from the same old prompt list, for ohpineapple on Tumblr again.

Her name is Ana Santiago Peralta (he's the one who insisted she takes her mother's name first, because you're the one who kept her in there for all these months, babe, you deserve the reward!) – 5 lbs., 9 oz., 18.8 inches and a few strands of raven hair already visible on top of her little baby head when she first joins this Earth on a fine June afternoon, 3 weeks early but perfectly healthy, too impatient to meet her parents to wait any longer.

Her name is Ana Santiago Peralta, and she's the most precious thing Jake and Amy get to lay their eyes on – they fall in love with her the very instant the nurse puts her in the woman's arms after 16 hours of tiring, painful labour, telling them it's a girl through the newborn's cries, and her mother sheds a happy tear when she points to her face to gently, ever so softly, skim at her tiny, pink, delicate cheek, her eyes never leaving her form and her husband fully crying next to her as he watches the scene in complete awe. This is their daughter he's looking at.

"Welcome to the family, pal."

She's a little older than three months when Jake manages to come back home early in the afternoon after a rather uneventful day at work, and all he wants – all he could think about all day – every day since his paternity leave ended – is to hold his baby close and kiss his wife. He finds them sitting on the couch when he enters the apartment, Amy holding their daughter in such a way they're facing each other, her hands carefully clenched under Ana's arms to keep her balanced while her little onesie pyjamas-covered feet are resting on the woman's lap. All of the baby's attention is set on her mother while she talks to her, a huge grin lighting her still tired face seeing what the sound of her voice does to the infant – the way she never stops looking at her, somehow captivated.

The detective pauses in his tracks for a short second, taking in the sight with a beam of his own, his heart filling with pure bliss in his chest. It's for moments like these he's grateful his captain understands his need of being home and lets him quit the precinct early during the calm days. He quickly joins his family, though, unable to remain only a spectator of the scene for too long. Arriving from behind Amy, he puts a hand on his wife's shoulder to let her know he's here, squeezing gently there before he blows a small kiss in her messy hair then draws his whole attention on Ana, with his face suddenly appearing beside her mother's.

He's smiling broadly when he reaches to poke her with his free hand, leaving it there to softly tickle her belly. "Hi, baby!" he says and his daughter squirms at his touch and the surprising new head that came out of nowhere. Her stare switches from the woman holding her to her father and, without a warning, she lets out a new, never-heard-before happy sound when she recognises him.

Jake's eyes grow bigger as he turns around to exchange a glance with Amy. "Did I just make her laugh?" he asks, a little puzzled, his heart starting to race fast in his chest at the simple thought of it. He then looks back at the infant. "Did that make you laugh?" he repeats, tickling her belly a little more before disappearing then reappearing from behind his wife again like he just did.

This time, when Ana opens her mouth again, the sound lasts longer, allowing it to become clearer – and it's clear that sound's a laugh indeed.

"Babe, I'm making our daughter laugh!"

Jake seems so astonished and touched by the fact, unable to stop his silly movements and own bursts of laughter every time his daughter does now that he found how to trigger their baby, Amy doesn't know what makes her laugh too the most: him, or Ana's adorable, become uncontrollable giggles.

Probably a mix of the two.

What she's sure of, though, at that moment (has been for long already), is that she loves them both so, so much, and that she'll hold this memory dear in her heart forever, always remembering the sound of her daughter's first laugh, accompanied by her husband's and her own – it's actual music to her ears.

(Her name is Ana Peralta Santiago, and making her laugh soon becomes her parents' favourite activity when they're all at home together, the happy sound filling their happy household with pure happiness.)