About a year ago my wife walked in on me trying this out. I think it was the 2nd time I had done it. And since then this is always how we have finished off sex or any bedroom activity. She will give me a blowjob but before I cum she stops and tells me get in the position. She gets off on watching me do it. She will sometimes ask me to do it while she just watches. I can safely say I’ve done this at least 2 times a week for a year now. I must have eaten so much of my own cum.