I thought that my girlfriend was completely committed to me, until I found her lying back on our bed with her legs spread: she was being pounded by a really hot gym-fit guy who was everything I could never be.

I've always been awkward and nerdy. I'm tall and slim, and I've never been confident. I come from a small town in England and, even though I'm in my thirties now, I've always struggled making friends. I know that I'm punching above my weight with my girlfriend. She's much more attractive than I am. But that didn't seem to matter, because she was attracted to my personality: she liked that I had intellectual interests and could talk about obscure subjects.

So my world was shattered when I entered the bedroom and found her moaning and shaking with pleasure. I couldn't get angry though. I was just stunned. I was frozen in shock. I couldn't challenge this guy: he was so clearly my superior, and I could see that he was giving her much more pleasure than I ever could.

My little cock had never really been able to please her. I tried my best, but I just couldn't fill her up. I thought my tongue would be enough, but she was being fucked hard by this guy's thick powerful cock and she loved it. He held her down and kept fucking her as I watched in astonishment.

When he finally shot his load inside her, she gestured towards me and told me to get down on my knees, as I did most nights. But this was different. I was licking his cum out of her as he watched and laughed.

Now I don't fuck her at all. I'm not good enough. She has a bull for that. I just kiss her feet and rub my pathetic cock as she spits on me, slaps my face and tells me everything that he's done to her. We cuddle up after she's humiliated me and I feel so satisfied after I cum for her.

Sometimes her friends make fun of me too; they know our situation. And I'm happy with that. I enjoy when other girls humiliate me too. I'd like to find a mistress or a dominant female friend I can visit when my girlfriend is with her bull, because she allows and encourages me to serve other women. I crave being degraded and treated mean.

But, most of all, I just feel good that I finally understand my place, and I'm grateful that I'm still able to serve my girlfriend and do my best to make her happy, even if I'll never be able to give her the sexual satisfaction that she really deserves. I love her, and that's why I'm always going to be her loyal cuck.