Ora, Yomekko sa ikuda! ~ Kosupure JK no Himitsu no Aijou ~ 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

A high school teacher who only loved 2D girls, suddenly falls for one of his students who is also an anime enthusiast! Somehow, they end up living together and get engaged in a secret JK relationship!