It is fun to get caught!
I am married and my wife does not enjoy sex much anymore. So I enjoy masturbating and she doesn't mind. I will tell her that I am going to go take an afternoon nap. Really I am just going to play with myself for a really long time or till my wife comes to check on me. I will lay on the bed with my legs spread wide where I can stroke my cock and rub my balls and asshole.
With my other hand I will play with my nipples and make them rock hard. So after a while my wife walks in on me and there I am stroking it. She says oh my what a lovely sight but you have been a bad boy for jacking off and not telling me. So you are going to have to shoot that cum in your mouth and any that misses it I will have to feed it to you with a spoon. So I bend my head down as close as I can to my cock and let it go. Oh what a great feeling to shoot warm cum in your own mouth and my wife loves to watch it. What a fun way to masterbate. Every man should try this with their wife or girlfriend. She will love it!