The case about two sisters becoming extremely obsessed with me after i saved them is a Manga/Manhwa/Manhua in english language, SUGGESTIVE series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

Arisa and Aina are beautiful classmates who are famous for their dislike of men. Hayato, who happened to be involved with the two, will receive "special treatment" from the girls who are supposed to hate men――!? "I want to be a slave to Hayato-sama...""I want to fall in love and conceive his child." The long-awaited comicalization of the unpredictable rich romantic comedy has started!