So, the phrase seems to roughly translate to something like "The Girl Who Was Taken Away by My Damn Younger Brother" or similar, depending on the context. The addition of "rj011 top" at the end seems to suggest this might be related to a specific ranking, file name, or identifier for content, possibly fan-made or otherwise.
This is "hard NTR." It doesn't shy away from the darker aspects. The corruption is gradual but inevitable. The contrast between the "pure" love the protagonist has for her and the "filthy" acts she engages in with the brother is the core selling point. kuso ero gaki otouto ni ubawareta kanojo rj011 top