Isekai Saikou no Kizoku, Harem wo Fuyasu Hodo Tsuyoku Naru - Vol. 5 Ch. 40 - To bind. And bind again.

[Retro68]

Ugh. I pictured it. I now need brain bleach...

 

[Amenohi]

Do not underestimate the things you can do with bondage games...

I checked the ropes on page 12 and lo and behold, I can actually imagine how to get her measurements from those.