Otsumu Tenten ~Onii-chan to 3nin Musume no Mattari Ecchi na Nichijou~ おつむてんてん~お兄ちゃんと3人娘のまったりエッチな日常 Gatsun Soft https://vndb.org/v1786 In this thread, I can find this premium link. All others links seem to be dead.