[A/N: here's some sibling/future in-law fluff because I've been reading Cateye992 's fic and it got me in the mood to write some 🙃]

Tina sighed and frowned down at her work that was scattered across the kitchen table as Theseus crossed the room to pour himself a cup of coffee.

"You alright?" 

Tina looked up. "Hmm? Oh, yeah." She started to look back to her work, then said, "thanks for getting me situated at the ministry, by the way, and getting me an office and everything." 

Theseus leaned back against the counter, stirring his coffee. "Of course." He took a sip. "We need your help. You're an excellent auror." 

Tina laughed. "Says who?"

Theseus arched an eyebrow. "Well, my brother, for one, and that's saying something." 

Tina frowned. "Newt? What did he say?" 

"Said you were brilliant," Theseus replied matter-of-factly. "And he hasn't got the best opinion of aurors."

Tina raised her eyebrows in agreement, leaning back in her chair. "I think his exact words to me were 'you've gone middlehead'." 

Theseus groaned and rolled his head back. "Oh, him and his expressions." He took another sip of coffee and he and Tina chuckled together. 

"He's a dork," Tina said fondly, and Theseus said, "mm. Tell me about it." He pushed himself off the counter and pulled out a chair around from Tina at the table. "He is very fond of you, though." 

Tina furrowed her brow. "Me?" She asked, as if there was anyone else he could be talking to. Theseus moaned as he drank his coffee. "Oh, when he got back from America, it was always 'Miss Goldstein this' and 'Miss Goldstein that'. And he'd really go asking questions about my work with a sudden interest as if I hadn't been working at the Ministry for years."

Tina smiled and propped her chin on one hand. "Maybe he's the one who's gone middlehead." 

Theseus laughed and shook his head. "If he has, I'd have to congratulate you. He's not one to change his views quickly."

"Mm, I'd noticed," Tina muttered from her comfortable position. Theseus watched her for a moment, nestled among all the parchment at the table. Thinking perhaps his last statement had sounded too negative, Theseus clarified, in part to himself, "I do love him, though." 

Tina nearly said, "so do I." 

"What are you two talking about?" Newt's groggy voice interrupted as he wandered into the kitchen, hands in his pockets and shoulders shrugged against the morning cold. Tina glanced at Theseus, who sent her a cheeky smile before looking to his brother and saying, "you." 

Newt fumbled with the coffee and looked back at them in bewilderment. 

"And your distaste for aurors," Theseus added, shifting back in his chair to better view his brother's expressions. 

"Well, there are a few I don't mind," Newt said with a smile as he finished pouring his coffee, and took a sip. 

"Well, perhaps you've gone middlehead," Tina said, and Newt beamed that she'd remembered his saying, but watched with some confusion when she shot Theseus a smirk as he choked on his coffee.

"I haven't gone middlehead," Newt retorted. "It's just that the characteristics I do have a distaste for in aurors--don't apply," he said to Tina,  "to you." He nodded towards his brother. "And not quite so much to Theseus."

Theseus grinned. "But I'm your brother, so you love me regardless." 

Tina pulled her legs up onto her chair and smiled between the brothers. Newt shook his head at Theseus and sat at the table between the two of them. "If you say so, Theo." 

"Theo," Tina mused, and Theseus groaned. "Please don't." 

Tina crossed her arms, raising her shoulders with a smirk. "Does that bother you, Theo?" 

Newt glanced curiously between them and Theseus raised his eyebrows at Tina. "Two can play this game, Teenie." 

Tina scrunched her face for a moment, then nudged Newt excitedly. "Have you got any embarrassing nicknames?" 

Newt shook his head with a smile, looking down at his coffee before taking a drink. "Theseus has plenty of names for me." 

Theseus, who had crossed his arms behind his head with an eager grin, began, "There's Newton for when I'm cross with him, then there's Arty, for Artemis, and sometimes I'll call him Fido and--" leaning forward to muss his little brother's curls "--ruffle his hair like a wittle puppy." 

Newt ducked away and scooted his chair closer to Tina as she laughed at them. 

"Sometimes I just mash all his initials together and call him Nafs," Theseus added, taking a draft of coffee. Tina chuckled a little and repeated it to herself. "Nafs." 

"You'd be Peg," Newt offered, and Theseus scrunched his forehead in confusion. "Where's the P?" 

"Tina's short for Porpentina," Newt answered, and Theseus raised his eyebrows with a grin. "Porpentina?" He repeated incredulously, and Tina groaned and set her chin on the table. "Newt...." she moaned, and the addressed flashed an innocent expression as his brother continued to grin. 

"Porpentina," Theseus drawled again, and Tina shot him a glance as she fiddled with the button on Newt's sleeve. "Shut up, Theo." 

"Yes ma'am, Porpie."