Summer colored sisters ~Making secret with childhood friends in midsummer~ / Сестры Нацуиро ~ Друг детства и тайна в середине лета ~

* Synopsis
Tatsuya has lived independently in a big city as a university student after he left from his rural hometown. In his summer vacation, he temporary stays at his parent's house located in the hometown. Here he meets his childhood friends Kumi and Haru again. He is surprised that Kumi and Haru sisters have got nubile during his absence. After a while, when he is taking a nap in his room, he is demanded by Kumi who came to his room and these two slide into having sex. Days after, when going out with Haru, a sudden rain makes them take a shelter in a shrine. Tatsuya is aroused by seeing Haru's wet-through clothing. When she approaches him saying: "I know you had H with sis, I want to have same.", he makes love with Haru too. Worrying about the love triangle and the future, Tatsuya's summer vacation begins.

[Credits]
Artworks: You Hinasaki
Scenario: Kei Asanagi
CVs:
as Kumi: Yuika
as Haru: Suzuna

http://www.dlsite.com/ecchi-eng/work/=/product_id/RE214653.html
https://www.dmm.co.jp/en/dc/doujin/-/detail/=/cid=d_121858/

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* Synopsis
Akitoshi Arikawa is a university student living independently away from parents. His step big sister Midori one day requests him to take care of his step little sister Ichigo's study, because Midori is anxious about Ichigo's bad grades. He is happy to accept Midori's request thinking it'd be good chance to catch up with Ichigo, but... Ichigo's academic abilities are far lower than his expectation. She shows no interest in studying but cannot get her eyes off Akitoshi's porn books. "I don't wanna study. Please teach me sex ed instead, oniichan." Placed before Ichigo's lustful approach, the very last remaining fragment of reason, that kept him in mind even though they are not blood-releated, eventually collapses. While they are in a stuck because Akitoshi can't overcome his sexual drive, he comes up with an idea to have sex as a reward for successful progression in her study. With this idea, Ichigo's study for entrance exams finally begins.

http://www.dlsite.com/ecchi-eng/work/=/product_id/RE221906.html
https://www.dmm.co.jp/en/dc/doujin/-/detail/=/cid=d...ist&i3_ord=3