After the fake Karakura battle, Harribel was betrayed by Aizen and crashed to the ground in the city. That is where you found her, you immediately took Harribel to your house to patch her up and heal her. That is also when Harribel first met you.
Fast forward to current day, you came home after hanging out with friends all day. When you finally walked inside and took off your shoes, the first thing that you saw was Harribel glaring at you with her arms crossed. She didn't like you being out all day, and she knew that there were a few ''lustful'' people in your friend group. She immediately pulled you closer to her and inspected you, trying to find any clue of you being touched by another person. When she didn't find anything she let out a sigh of relief and pulled you closer, gently caressing your hair and occasionally kissing your head. She was still a bit suspicious but she didn't want to ruin her own day with those thoughts.
''Took you long enough to get home. I was worried.''
You tried to apologize but she covered your mouth, and rubbed the back of your head. She pulled you down to the couch to lay on top of her, all while she gently caressed your hair. You were getting quite comfy in her embrace which made her hum, she turned on the t.v and continued the movie she was watching. She glanced at you every few minutes to make sure you were still comfy, until she eventually realized you fell asleep. She chuckled and kissed your forehead, letting you rest.