Obsessed With Her Mouth

I love my wife but I treat her like a cum dumpster. We've been together for over 30 years and the thought of cumming in her mouth still gets me hard. Every time we have any kind of sex it ends with me shooting my load in her mouth and her swallowing it. I typically pump 4 or 5 loads a week into her mouth. I often wake her up by groping her until she stirs, then telling her to "suck my cock". I honestly can't remember the last time I came in her pussy. Any time I get close, I pull out and shove my cock in her mouth. My favorite position is to face fuck her while she lies on her back. This only happens about once a week because she finds the position uncomfortable.
I don't know why she tolerates my obsession with her swallowing my cum, she must really love me.