this was a little longer than i intended, but here you are!! i don't know much about their main shared interest (gundams...) so, i went with a secondary, and a couple of headcanons. i hope you enjoy!

It was a cold morning in Odaiba, yet the passion pumping throughout Nana’s body kept her warm. Today was a special day – one that she was going to share with her beloved boyfriend, Chiaki – it was the grand opening of a brand new collaboration cafe! While it wasn’t one of their main shared interests, it was a Pokemon one, and featuring BOTH of their favorites! Charizard and Armarouge, all in one!

“Alright! I just have to get ready for today…” Nana yawned, rubbing her eyes and heaving herself out of bed – she was used to late nights, but had such a hard time falling asleep due to all of the excitement coursing through her veins. She tip-toed over to her full body mirror, not wanting to alarm her parents with her heavy steps.

It didn’t take her long to fix her hair into braids, or get out of her ill-fitting, striped pajamas and into something much more stylish – a red hoodie that managed to fit snugly over her tummy, tightly fitting white shorts that hugged at wide, jiggly thighs – and insulated black tights underneath those shorts that were struggling for dear life. To finish it off, she wanted to match her favorite Armarouge, so she grabbed one of her plethora of bags, heavily styled, yellow and cross-bodied with tons of pins attached to it and threw it on. To finish the look, she put on big, circular golden glasses.

Hurrying down the stairs and now officially alerting her parents, she rushes towards the door.

“Mom! Dad! I’m heading out! Chiaki-kun and I have an important reservation to get to today!”

Mrs. Yuki looked over, away from the sizzling pan beneath her. “Eh? Nana-chan, what about breakfast?”

“Just put it in the fridge for me! I’ll have it when I get home!” Nana grinned, and just like that – she was gone.

“That girl’s so full of energy, and yet…” Mrs. Yuki shook her head.

…

“Chiaki-kuuuuuun!” Nana beamed, frantically waving at the man standing in front of the train station, almost like an over-excited puppy.

“Nana-chan!” Matching her enthusiasm, Chiaki beamed back. He opened his arms wide and awaited her – and just like that, she leapt into them. “You look so cute today! As expected of my beloved Nana-chan!”

“And you look as cool as always!” There was no lying there – he really did look cool, with his oddly similar hoodie (though, black-and-red as opposed to just simply bright red…), sleeves rolled up, with his nice, toned, tan arms… There was a certain warmth radiating off of him, too – Nana mumbled something under her breath, eyes locked into place staring at those strong limbs…

“...na-chan? Nanaaa-chaaan?” Chiaki poked at the girl’s forehead.

“Eh? Ahhh! Sorry! I got – distracted – In thought! About! Pokemon!”

“Fuahaha~ You always do get lost in your thoughts! It’s cute, but we have to go!” Grabbing ahold of Nana’s hand, Chiaki began to drag her further into the city of Akihabara.

The pair made their way over to the cafe. Luckily since they had a reservation, they were taken right in and seated!

Nana sat down, the seat creaking beneath her – and her face flushed slightly.

“Now, Nana-chan! This meal is my treat, so go ahead and order whatever you’d like! I just got paid today!”

“Huh? Are you sure?” The lingering thoughts in her head about the dying chair beneath her were pushed out by thoughts of delicious, themed cafe food. In all reality, Nana knew that it wasn’t going to taste all that good – but… her eyes scanned over the menu, anyway. “If you say so, Chiaki-kun! We can work all of this off after, anyway! We’re here, so let’s make a day out of it!”

…

They did indeed, make a day out of it – but only after Nana had scarfed down two plates of curry, a special Charizard-shaped sandwich, several drinks, and at least five extra delicious strawberry Armarouge butter cakes.

And god, was she stuffed.

“Setsu-na-chan~ Do you need a hero like me to take care of you?”

“Ch-Chiaki-kun…” Nana gulped. “It’s cold, in this alleyway, you know, I-”

Chiaki’s warm hands held her aching, stuffed gut – that red hoodie rolled up entirely, leaving her gluttonous shame on display. “In an alleyway, too, that’s not…! What if someone…”

“Setsuna-chan is for my eyes only, so I’m not going to let anyone see you!” His fingertips dug into her, and he rubbed against her gut graciously, soothing the inner lining of her heavily bloated intestines. “When you’re like this, Setsuna-chan, I just…”
“Naanaa– call me Nana! If someone finds out, my career–”

“If someone finds out, then I guess Setsuna-chan – or, Nana-chan, rather, will have to become my housewife… I’ll be the luckiest man alive, waking up to a freshly made bento everyday, and greeted by our five children, hahaha~”

“Chiaki-kuuuuuuuuuun!!!!!!!!!!” The thought of five children was enough to make Nana’s head spin.