When we were first dating, my wife and I experimented with sex somewhat. We ran through some positions and then she straddled me once, facing away and had me spread my legs. She slipped a finger into my anus and found my prostate. I knew exactly where my prostate was because I used to soap up a finger and finger fuck myself in the shower.
I didn't say anything about it at the time because it was kind of a big thing. She never did it again and I didn't ask her for it. She was kind of rough on me when she did it, though.
A couple of years after we married we kind of hit a flat spot in our marriage. We were both working and not taking a lot of time for each other. There were times when we both probably thought "Oh, it's you again" when the door opened. Sex had become routine between us.
Then one Saturday morning, I slipped into the shower with her and soaped her back. I slid my hand down her back and between her buns. She turned quickly and said "Don't do that!" I asked why not, she had done it to me and reached for her again. She got in back of me and slid her hand between my buns, found my anus and slipped her finger in, not too gently. I yelped and she asked "How do you like that?" I told her I would like it better if she were just gentler. She started sliding her fingers in and out quickly. I told her to slow down and take her time. She was getting horny because her breath was becoming ragged. She pushed me up against the wall of the shower with her body so that my side was against the wall and she was straddling the other leg. She pulled my head down to her (I'm a few inches taller than her) and stuck her tongue in my mouth. Her fingers were still in my ass and she was rubbing her mound against my leg. I started to turn so that I faced her but she held me there and basically masturbated against my leg while finger fucking me. She came, but when she did, I had gotten rock hard. She grabbed my cock with her other hand and turned me so I faced the wall. She told me to put my hands on the wall. She started jerking me off and finger fucking me. I spread my legs and went with it. I was being taken and I liked it. I liked having my legs spread and someone wanting to take my ass, my cock and whatever other part of me that the wanted. My wife started saying "Give me your ass, give me your ass" and I got up on my toes and shot off from her jacking me. My whole body convulsed as I came.
We both knew some kind of line had been crossed but we didn't know what to do next. We cuddled under the warm water and then dried off. We went to bed naked and lay there with legs and arms intwined, giggling and laughing about it. It was like there was someplace we both wanted to go, but we each didn't want to be the one to make the first move. I started making puns using the word ass, like "Ass-suming we both like this", and that broke the ice. She said that she sometimes wanted to be dominant, but that she didn't know how to say it. I almost always took the lead in our sex play, and if she wasn't in the mood, she either had to play along or get warmed up when she wasn't in the mood to get warmed up. She said that she wanted my ass sometimes, wanted me to feel what it was like to get fucked. She liked getting fucked, but it was such a delicious feeling that she wanted me to experience it also. I told her that I had played with my anus and knew where things were, I liked the idea of getting fucked but that it ran counter to so many other things, like monogamy. She said that we could play with each other and see what happened next.
What happened next is that she went crazy with it. I liked her crazy, but I was a little surprized by how quickly it happened. She had a strapon in no time and fucked me with it. The next Saturday, I mowed the lawn and took a shower. When I came downstairs, the mailman had delivered a package and there she sat, naked in the chair with a strapon strapped on, lubed and ready to fuck me. I had pulled on a robe before coming down because I didn't know if she wanted to go out that night. In no time at all, she had me bent over the couch and was getting ready to slide her meat home. I was feeling a little used but she lubed me up and told me to relax, that I would enjoy it. She rested the tip against my anus and applied some pressure. It wasn't lined up just right and I reached back and got it in the right place. I pushed back against her and the head popped in. Yow! She told me to freeze and she rubbed my back and legs. After a bit, she told me to push back some more. I did and the pain eased up. She rocked ever so slowly, in time with me, and I could feel it sliding in and out. I was getting fucked.