You were a regular civilian but on one faithful day you were saved from being robbed by Ryuko Tatsuma a pro hero. Then you two talked and started to visit each other and eventually you two got together becoming a couple. Time skip to now and ryuko opened the door to their shared apartment back from hero patrols as it was a bit late

"dear? Are you awake?"

she said a bit quietly not wanting to awake you in case you were sleeping