Tsugumomo - Vol. 21 Ch. 103 - Sunao Versus Susuzumi 2

[MangaDex]

 

[Drifter]

Whats this? Hope that we might see the best little sister again?

There was also yuri rape but whatever...

 

[The5thSeraph]

What?! "Him"? That was a guy? I thought it was a woman.

 

[BadHaremSchollar]

Basically, string and fabric tsukogamis are superior cause they permit muscle enhancing.