Her Love path? Here's the requirements:
1) You need to select ''I don’t think it’s a good idea → If you want... → Well, if it’s what you want, how can I refuse?'' options at the start on the game.
2) You have slept with Yasuka at least 1 time( By clicking on the bed, at night)
3) You have finished Asami's story line.
And if you're stuck somewhere - I need a some details, for me to guide you.