Basilis no Masume ("Daughter of Basilis") by Chiho Saitou 4 volumes-complete
The story revolves around the famed horse Basilis, it's powerful owner: the Midorkawas and the women who can tame the two in 1920's and 1990's. The story has a prequel and sequel of the past and the present. It's an earlier work of mangaka of 'First Girl'. It has the same elements of First Girl: smutty, different bishies as the story progress and the theme now is sculpture but with a darker plot. Thanks to Julie for the tip!