Follow the full romance path for Woljif Jefto that should have been in the game to begin with. The romance path is available for both male and female characters, and begins in Act 3, with content continuing through the rest of the game up to and including the epilogue. At last you can give the tiefling the love he deserves, but winning his heart won't be easy...
Be aware that like official owlcat romances, this romance path contains wilderness camping events, command room events, and in-base dialogs, as well as additional content in existing scenes! You will miss out on content if you don't set up camp in wilderness maps once in a while, or if you don't ever visit the command room.