1870 US Census shows following people in Fishpond, Barnwell, SC:

Henry Sease, abt 1826 South Carolina White Male
Emma Sease, abt 1855 SC White Female
James Sease, abt 1868 SC White Male
Julia Sease, abt 1859 SC White Female
Nancy Sease, abt 1858 SC White Female
Rebecca Sease, abt 1828 SC White Female
Ulysses Sease, abt 1863 SC White Male

Was your Henry Sease white? Don't see a black one listed.

1860 US Census shows a mulatto Henry Sease born 1825 listed with his wife and children, each of them mulatto:

Rebecca Sease 30, wife; Elizabeth Sease 12; Susan Sease 10;
Ellen Sease 7; William Sease 5; Emma Sease 3; Anna Sease 5.12 mo.

1880 US Census shows a black Henry Sease living with parents and several siblings. Coincidentally, some siblings have same first names as the white Sease siblings from 1870 census:

Adam Sease 52, abt 1828 SC, black; Rose Sease 44, abt 1836 SC;
HENRY Sease 21, abt 1859 SC, black male
EMMIE Sease 19, abt 1861 SC, black female
Hattie Sease 17, abt 1863 SC, black female
Frank Sease 15, abt 1865 SC, black male
JULIA Sease 10, abt 1870 SC, black female
Billie Sease 8, abt 1872 SC, black female
JAMES Sease 7, abt 1873 SC, black female
Genie Sease 4, abt 1876 SC, black female
Rena Sease 30, abt 1850 SC, black female