Wife only lets me cum through her giving me a handjob, is this normal?

For over 18 months my wife has controlled how I cum, and restricted this to handjobs only. Normally once per week she'll either simply jerk my cock so fast that I cum within 1/2 minutes. Or when she's feeling especially kind she'll fuck her with her favorite dildo while I lick her pussy/clit until she orgasms on my face as she literally milks my cock with me on all fours.

As I get to close to cumming I beg her to let me cum in pussy but this request is always refused, when I cum she often comments on the speed or things like "oh no, he's done already".

When we talk afterwards and I raise the issue she simply says that she knows I love it cos I cum so quick.