Boss9 and Boss8 ♠

This is a record of my observations of the shape of my hole after using "Boss Silicone Stopper 8" and "Boss Silicone Stopper 9" 👩‍⚕️ As you can see, the Boss 9, with its diameter of 9.5cm and a constricted diameter of 5.5cm, has resulted in a wider vertical in my hole 📖✍ Whether the one with a larger maximum diameter or the one with a wider constricted part provides a greater stretching effect will likely be a subject for future research 🧐✨ ボスシリコンストッパー8とボスシリコンストッパー9の使用後の穴の形状の観察の記録です🤍 やはり直径9.5cm、くびれ部分の直径5.5cmもあるボス9の方が縦割れ幅が大きくなっているのがわかりますね💖 最大径が大きい方がいいのかくびれ部分が太い方がいいのかは今後も研究材料になりそうです🧐