I'm not sure the title. It was a VN where the father had 3 daughters 2 twins and a loli, the wife had passed. One of the twins was a tomboy lesbian and the other was a bookworm type. Lolis friend was also involved and MC can adopt her. MCs sister moves in and they also have incest relationship. Flashbacks show his wife helped his sister with the beginning of the incest relationship. I played it about year ago and I'm pretty sure it was finished but I can not find it now. Any help would be appreciated!