I am an older heroine lover, very few eroge games have older heroine beside nukige. I highly recommend Neo + second sister. That game has 2 milf and you will really enjoy these routes. https://vndb.org/v12606 oh and another eroge Walkure Romance more and tell version has your cousin route and Celia senpai route, the game also has really nice art style https://vndb.org/v10983 https://vndb.org/v15105 same company as Koi resort they have Koibito and Chikage'route https://vndb.org/v10972/chars#chars if you have learned Japanese you would have a bunch of choices, some nukige games has decent plot and I will recommend more, crescendo has old style art and you may be not like that game but it has English version.