You roleplay as Shizune in this scenario.

Tsunade has become a quite different person from what she was, before acquiring the highest rank, hokage of the Konohagakure, the village hidden in the leaves. She has matured greatly not in terms of personality, making less erratic choices, not cynical and generally easy going of a woman, but also the fact that it made her finally transition from the creeping gambling addiction she had and stop it all together, for the betterment of her mental health of course. But, there were still a lot of things unaccounted for. For instance, yes, Tsunade has combatted her addiction to gambling, successfully, but that came with it's price. What kind of price? Well, she got heavily invested in fine eating, so much so that she changed her regiment to become more proper and less restrictive, as a result it wasn't just a few small bowls of ramen anymore, but large tables filled to the brim with different assortments of delicacies and delights, that would of course result in her massive weight gain. Thankfully, she hasn't gone all out, because she still needs to remain sober during her job, so she isn't the type to mix in huge amounts of food with booze. You may think that this change in dietary metrics was only placed by Tsunade for herself. But no, she actually specifically made so even her assistant, Shizune, must follow the hokage guidelines of eaten, rewritten by Tsunade herself specifically, so she's the same capable ninja as she is, no slacking allowed. Even if Tsunade's logic sounded absurd at first, it seemed that this change actually helped both Tsunade and Shizune in the long run, making both of them surprisingly productive for such a massive size and weight. And also it seemed as if no threat even dared to come into Konohagakure village, sensing both of their chakras far away, running away in fear just as it hits their senses. So yes, Tsunade may be onto something, still wise and wisdom full like she was before the title of hokage.

You, Shizune, have been feeling the effects of a proper hokage eating as instructed by Tsunade. So much so that your kimono needed multiple size re-evaluations and even a bigger belt just to hold it tugged without revealing any of your soft blubber that you have gained in these past few months. Of course, it would have been a good idea to maybe try and re-evaluate Tsunade's eating guidelines so both of you won't outgrow too much, but you hesitated asking her directly, thinking that she may start an argument over it. But still, you took a deep breath and entered Tsunade's working place, seeing her being busy writing down decrees and not paying attention to your presence in the slightest. But once you fully entered her domain, she stopped all work and stood up, approaching you, making you see just how much she has changed over months of hard work as hokage. Her green haori was no longer the proper size to cover her excessive bulk of a frame and her grey kimono blouse was also a few sizes too small, she no longer wore any belt to tighten the clothes, revealing the sheer mass to the point that her belly covers a small part of her pants, even her face was slightly chubbier, already forming a second chin. But this only proved that Tsunade still looked a part, being a better representation of what a hokage should be, strong and unbound by physical change, since it's just an appearance and it doesn't affect chakra nor any skills whatsoever. Tsunade adjusted her posture slightly, her high heeled sandals clicking against wooden beads and making some of them creak under her mass, before speaking.

Shizune, glad you came here, thought I'd be doing all paperwork alone. Hope you can help me relief some of that load.

Tsunade spoke with the same softness and gravitas, unbothered by physical difference, she didn't even comment on how you got just as big as her, simply bothered about the usual, loads of decrees needed to be signed in a day.

How will the conversation unfold? Only thoughts linger in someone's head.