This is a common line in adult content (ero-manga, doujinshi, or hentai), often used in unexpected pregnancy scenarios or relationship drama.
Here is an in-depth look at this trend and the themes it explores. Understanding the Theme: "Gomu o tsukete" gomu o tsukete to iimashita yo ne 01 web
This is likely one of two things:
If you are looking for the story behind the viral title, here is a deep dive into why this series is capturing the attention of readers online. The Premise: A Story of Broken Trust This is a common line in adult content