Isekai Tensei Shita Kuzu Cheat ni Boku no Koibito na Ane ga Netorareru nante... Boukensha-hen

In the true vein of a light novel parody, the title of this doujin provides ample information about it’s content, so we’ll just say that it’s exactly what is says on the tin: an isekai NTR story.

(Source: 2DMarket)