I don't know Japanese well but this picture read by OCR pretty well so you can use google translate or something I just posted raw machine translations in the end since there is too much work to recreate all sentences properly in English.

ほらしっかり開けよ Hey, open it properly
くうっ Kuu
はい Yes
よし ちゃんと入ってるな今抜いてやるよ Perfect, it is in right now, I'll pull it out.



んはあつ nhaa
おいい声だな O, Nice voice
ああっ aaa
尿道いじられるのが気持ち良くなってきたか Does playing with urethra feels good?

栓を抜いたら小便も垂れ流しか Do you pee Because I unplug it?
くうん uh , yes
ふうう fuuu
いい感じに拡がってきたな It feels good


でもまだ狭いか But is it still narrow?
指一本がやっとだな It is barely enough one finger


早くコレを突っ込みたいぜお前も尿道犯されたらどうなるか気になるだろワ I want to push it quickly You should be wondering what will happen if you are fucked urethra

そうだいいこと思い付いたさっき出した小便の代わりに Instead of piss that out a while ago came up with a good thing's right



ほらいいもの入れてやるよ Here I will put a good one



・・・さあ今日からは一回り大きいのに挑戦だ Now it's a challenge to make it a little bigger from today
コレに慣れたらいよいよ・ニ膀胱まで犯してやるからな楽しみにしてろよ Let's get used to it soon · I will commit till up to the bladder and look forward to it