[M/F] Wife pegs me for the first time

Yesterday my wife and I are riding the train home from a family gathering while trying to recuperate from the events of the night before. There wasn't much dialogue between us as we struggled to stay awake. My eyes were closed and I was passing in and out of consciousness when I felt her hand gently start rubbing my package. Usually I don't allow touching in public but it was feeling fantastic as the sensations travelled through my body. She leaned a little closer and whispered in my ear "Tonight, I'm fucking you". I knew exactly what she meant because we had previously discussed the idea of pegging but she seemed less than impressed by the idea of it.

We made a stop at our favourite sex shop and finally decided on a purple 8'' strap-on. The tension between us rose as we finished our commute home and she made subtle gestures of what was to come. Neither of us have explored our sexual side in depth and usually sex is the same vanilla routine a couple times a month. I could tell my wife still had some reservations about the idea, but I know she likes to dominate me in bed and figured this would bring out her freaky side.