Been married awhile and had asked a few times, for the wife to clean me off after lovemaking but she had never agreed to. About a year ago, before we went to piv which she really wanted, I told her a condition was to do this afterwards. And....she did. It was cute her initial hesitancy, as she started in with about 10 slow licks, and then she moved onto more of a normal blowjob action for a minute or two.
Nicely, she has done that a few more times, when afterwards I have playfully waved my cock around and say "hey!"