It's Valentine

I send a txt to my son:
"Big Trouble. I can't make it for dinner, your mum will get really mad when she'll know I have to work at  Valentine's day."
After few minutes he answered:
"What's wrong?"
"Just problem at work, but I wont' be home before 2 hours. Is she already home?"
He answered me with a picture:

"Don't worry dad,  she'll find you waiting for her. You owe my a favor."
 "Thank's son. You're the best. Be nice with her, remember: it's Valentine's"