It has been almost half a lifetime since I first became interested in family education.

I was in my early twenties and in my first long-term relationship.

My girlfriend at the time seemed like an innocent country girl, but in reality she was a sly one. Her sex drive was just as strong as mine, and I soon discovered that she also had some very unusual preferences.

We experimented a lot, discovering ourselves and each other.

Vanilla sex didn't get boring, but we both felt that there was more to it and that we wanted to satisfy our curiosity together.

So it wasn't just missionary position in bed and some oral sex as foreplay anymore; we had sex outdoors, in parking lots, in the swimming pool, soon she had my finger in her bum, then my cock, and a little later she knelt in front of me in the shower and asked me to pee on her.

At that time, there were several television programmes on the subject of sex, and we almost always watched them together. Afterwards, we talked about the reports shown in each programme and exchanged ideas about what turned us on and what we could imagine trying out.

I remember that once the topic was cunnilingus. Two of the young women interviewed gave their opinion on it: ‘Licking pussy is submissive!’ When my girlfriend clapped her hands in agreement and exclaimed, ‘I totally agree!’, it suddenly dawned on me: she had never particularly liked it when I licked her – I always thought I just wasn't doing it well enough; now it turned out that she didn't like it because she didn't want to see me in that role. And other behaviours of hers suddenly made sense, too.

In short, we had another embarrassingly frank conversation, at the end of which we agreed that she should live out her submissive tendencies in our relationship. She ended the part of the conversation about taboos succinctly with, ‘If I'm going to do it, I'm going to do it right. If I submit, then I'll do it properly and you can do whatever you want with me!’

I looked at her critically for a moment, weighing up whether I should give her another chance to set limits or at least choose a safeword, but ultimately decided against it – she knew what she was getting herself into and nothing would happen to her with me anyway.

So I asked her briefly and concisely to undress, which she did without making a fuss. I told her to fold her clothes carefully and put them in a pile. She then had to hand me this pile.

I disappeared briefly into the bedroom, put her clothes in my wardrobe, locked its door and took the key.

Back with her, I told her that from now on, whenever we were alone at my place or hers, I expected her to take off all her clothes without me having to remind her again, that I intended to keep her completely naked.

Then I asked her to stand in front of me with her legs spread shoulder-width apart and her hands behind her head.

Just seeing her like that made my cock swell.

I stood behind her, pressed my erection against her bum and began to gently stroke her body with my hands, over her stomach, her hips, her bum, her thighs, her breasts, until I finally reached between her legs with my right hand and slid my middle finger through her slit. She was soaking wet.

I grabbed her by the hair, pulled her down onto her knees and let my jeans and underpants fall to my ankles. A brief ‘Suck me!’ was all I said, but she knew what I expected anyway and complied willingly and devotedly.

My lust rose to immeasurable heights.

I instructed her to bend over the back of the living room armchair with her legs spread wide and fucked her hard from behind. She came several times before I finally spread my load over her ass.