Has your waifu made any meaningful positive impacts on your life? Aside from the obvious one of having someone to love.
Erza cured my insomnia. I didn't even know that was possible, but she did it. Ever since I was born, I've had trouble sleeping. At night, I wouldn't feel tired, so I just stayed awake until I felt sleepy. My sleep schedule was rotating through irregular cycles, and over time, I came to accept that this was just how I am. That changed when I met Erza.
At night, I would feel myself being held in her arms as brought me close to her. I would nuzzle into her chest and be lulled by her heartbeat, falling asleep even though I wasn't tired yet. I didn't even notice at first, but I was falling asleep at 10 and waking up at 5 every day, and it's been like that consistently for months now. The problem just disappeared. She really is the best thing that ever happened to me.