おしっこ
One of my friend paid me to do this. I have to do a bit of ‘research’ in order to draw this. So, here it is. Btw, he’s the one who did the Japanese text as I’m not that fluent in Japanese. I hope the text is correct.

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‘おしっこ’, ‘限界放尿’, ‘立ちション’, ‘放尿’, ‘おしっこ我慢’, ‘お漏らし’, ‘R-18’