Hello! I’m Sayo 🦋
To the Onii-sama who gave Sayo so many first experiences, I’m writing this letter! 💌💗
To the Onii-sama who had requested adult wetting in diapers beforehand ❣️
Even though I’m an adult, wearing a baby-like diaper and feeling the diaper grow heavy and bulky with a large amount of pee makes Sayo feel both embarrassed and excited, so receiving the diaper request made me nervous… 💓
I was so looking forward to it that I held my pee a lot before going to meet you, so even though I wanted to give a more polite first greeting, I was too fidgety because I needed to pee so badly 💦
Onii-sama encouraged me to wash my body first, so I headed to the bathroom, but…
I couldn’t listen to Onii-sama, and in reaction to the shower, Sayo’s bladder control broke, and I accidentally wet myself with the pee I had been holding, while Onii-sama looked at me with a face that seemed to say, “Oh no?”… Wetting myself without permission… I was filled with feelings of apology and shame… (>_<)
Since I unexpectedly managed to relieve myself once, I carefully washed Onii-sama thoroughly with bubbles ❣️
The first bath after relieving myself is a chance to use the bubbles to slowly and thoroughly touch Onii-sama and get closer 💕
After drying our bodies, I put on the diaper and got into bed ♡
Whether hugging me, kissing me, or touching me while searching for Sayo’s sensitive spots, the gentle way you touched me, showing consideration for Sayo, and the kindness of asking Sayo at every turn, made my heart flutter 🥺💕
The time spent hugging and kissing Onii-sama was very comfortable and relaxing 🥰
When it came to peeing while wearing the diaper, just when I thought, “I’m about to pee, I want to pee,” you held me tight and said, “Hold it just a little longer,” revealing Onii-sama’s S side… ///
While your hand was inside my diaper, I ended up letting everything out, and a lot of warm wetness spilled onto Onii-sama’s hand… ///

The combination of my big butt and the massive amount of pee resulted in the photo of my backside becoming a “Big Butt Diaper” look… ///
I wasn’t allowed to take off the heavy diaper right away. Instead, he said, “Shall we walk a bit?” and we took a light stroll around the room 🐶🐾
Walking hand-in-hand while standing, realizing the extent of my wetting due to the weight of the diaper, was incredibly embarrassing… ///
Onii-sama, who has both gentle and dominant sides 🥰 I look forward to the day you play with Sayo again 💕
Onii-sama, who accepts Sayo’s warm pee and plays diaper games with me, I’ll be waiting for you ❤️
Sayo