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She's got big love in a small body! Summer vacation is a taboo affair between imouto the oniichan she loves. For some reason "your" parents decided to go on holiday right when you came home to visit them for the summer. Cute little Hiyori and you are aaaaaaall alone in the house for two solid months! Nobody can look at her adorable features and not get excited. Siblings start with indoor fun... then take it outside!