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Based on the web search conducted, a comprehensive guide with specific tips and tricks for a game titled "Hentai Stepsis" could not be found. The search results primarily yielded discussions about an anime called "Gimai Seikatsu • Days with My Stepsister", which focuses on romance and plot rather than interactive gameplay, as well as general adult content and unrelated news items.

One relevant, albeit very old, finding was a forum discussion from 2004 regarding a game titled "Gibo - Stepmother's Sin". This discussion included mentions of walkthroughs for various endings, such as "Playing with Stepsister" and "Experimentation with Sister," and detailed steps to achieve certain scenes or endings within that particular game. For instance, to unlock the "playing with stepsister" event in "Gibo - Stepmother's Sin," players were advised to follow the "Dear my Sister" walkthrough, ignore a character named Shiina, and then choose a specific option to interact with her. Another tip for "Gibo - Stepmother's Sin" involved obtaining all blowjob scenes featuring Misako and a titfuck scene, often by following the "Dear my Sister" walkthrough and making specific choices. However, it is important to note that this information pertains to "Gibo - Stepmother's Sin" and not directly to a game named "Hentai Stepsis," and the information is from over two decades ago, making it potentially outdated for modern gaming contexts.

Without specific game information or current gameplay guides for "Hentai Stepsis," it is not possible to provide detailed tips, strategies, builds, or walkthroughs as requested.