Is There A Word For This?

Here's something that really amuses me:

My shins are often bruised--most of my non-writing work is pretty hands-on and physical, and I have very fair skin. 

Whenever I come home with an injury, no matter how small, my wife always makes a (pleasantly) big fuss over it. 

And then she'll bite my thighs, leaving bigger, deeper bruises than the ones I had...and we gloat over those. (She does nurse them if they need it, of course, and it's a part of play we both really enjoy.)

Does this happen to anyone else? Is there a word for this type of situation? I wouldn't quite call it ironic...