Shingeki no Eroko-san: Hen na Oneesan wa Danshikousei to Nakayoku Naritai
Eroko-san on the Attack

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Both are an ecchi romance. The couples do lewd things to one another and there's lots of blushing. In Sokuochi Mayuri-chan, the guy's the main pervert. In Shingeki no Eroko-san: Hen na Oneesan wa Danshikousei to Nakayoku Naritai, it's the girl. Shingeki no Eroko-san has the pov from both people, each chapter is longer, and there's more talking between them. 

Pretty much the same manga, but Hoshi-kun's parents didn't abandon him and Shingeki no Eroko-san has lots of ecchi.