"Aunt Mowwy! Unca Wock!" Rosie exclaimed, running toward them.
"Hello, sweetheart!" Molly greeted her, picking the little girl up in her arms to give her a proper hug. "Are you being a good girl for mummy and daddy?"
"The bestest!" Rosie replied. "Is Unca Wock being good?" John and Mary howled with laughter at the look on Sherlock's face. If his jaw dropped any further, it'd be on the floor.
After she got her laughter under control, Molly replied, "He's the bestest too." At that, Sherlock's face softened.
"Rosie's definitely your daughter," Molly told John and Mary. The little Watson reached out for Sherlock and he took her in his arms and pressed a kiss to her forehead. Molly felt herself melt at the sight.
"Dinner will be done soon. Rosie already ate because it's almost her bedtime," Mary told them.
"Aw do I have to?" she asked. "I wanna spend time with Aunt Mowwy and Unca Wock."
"You have a whole hour to spend with them before bed," John replied with a smile. Everyone had been quite surprised how quickly Sherlock took to Rosie when she was born. It was such a sweet bond they had together.
After Rosie had gone to sleep and dinner was eaten, the four of them were enjoying dessert and a couple glasses of wine. Unlike John and Mary, Sherlock and Molly were lightweights, so by the end of their second glasses, they were already tipsy. In fact, when they had returned to 221B in a cab, they alerted poor Mrs. Hudson with their laughter at each other's terrible pick-up lines.
"Are you a mystery? Cause I wanna unravel you." Molly snorted when she laughed after they had reached the sofa in their flat. She pushed his coat off his shoulders, pressing kisses to his neck.
"Mm," he sounded at her affections. "Are you copper and tellurium? Cause you, Molly Hooper, are CuTe."
"Oh God," she snorted. "That was bloody awful!"
"But you loved it," he pointed out.
"Touché," she replied. "We have such great chemistry, we should do biology together." She struggled with the buttons of his white dress shirt. "Why do you make these buttons work so hard? The tension is much too—" she covered her mouth with her hand when the buttons of his shirt flew off. More giggling ensued. "I'm so sorry."
"I've got lots of shirts," he waved it away. "Come here." Molly did as he said and sat in his lap facing him, her arms around his neck, snogging him like they were a couple of teenagers. " Will you be my Tungsten, Iodine and Iron?" W-I-Fe.
Molly laughed, "Sherlock, I've already agreed to be your wife, silly man!"
"I know…doesn't hurt to ask twice," he explained. Molly pulled her jumper off, tossing it on the coffee table.
"Wanna go form a covalent bond?" she asked suggestively, letting her lips linger on his from the soft kiss she gave him, leaving him wanting more before leading him to their bedroom.
Mrs. Hudson would soon thank herself in the morning for deciding to take her herbal soothers when she realized the state of her tenants when they returned. The new occupant of 221C wasn't all too pleased with the noise from the night before. The elderly woman advised the newest tenant to buy noise-cancelling headphones. She wasn't about to tell Sherlock to tone it down; not now, not after years of living without romance.