Kinkiest thing your wife has ever done?

I thought it'd be interesting to start a thread asking what is the kinkiest thing that your wife has ever done. This could be something she did before being married or something she's done specifically for you.

When giving me a blowjob, my wife loves making out after I cum in her mouth.

Back when we were dating, my wife gave me a handjob and after she finished me off she rubbed her fingers around my face smearing my cum on my face, then ran her tongue along my face licking it up before kissing me with a mouthful of my cum.

Weird and awkward the first time she did but very intense afterwards.

Her favorite fantasy is to kiss me after another guy cums in her mouth. Sometimes she teases me pretending its another guy's cum in her mouth when she kisses me after a blowjob.