Yes! I'll think about Sarah and Zoe together!

I grabbed my 5-inch cock and I listened attentively for the girls. I didn't want them to hear me, after all. But all I could hear over the water were muffled whispers from beyond the bedroom door.

It had been a hard day, and I needed some relief. I deserved it, didn't I? And since I was not going to have sex with Sarah, I decided I could have a little time for me.

I started stroking slowly.

Sarah had been stunning all day long. From her casual leggings and loose top to that gorgeous dress Zoe had given her. I couldn't believe how lucky I was for having such a sexy girlfriend. I stroked faster as I imagined her large, amazing breasts bouncing to her every step, and her perfect, big butt barely covered by her dress. I was dying to see her naked, to touch her...

But Zoe had beaten me to it. She had both seen my girlfriend naked first, and she had touched her ass first. And now she was also lying in bed with her. I mean, they weren't doing anything wrong, just sleeping in the same bed like the girlfriends they were.

Right? What if they... Were doing something?

Instead of my hands on Sarah's breasts, I imagined Zoe's small, delicate hands massaging them, caressing them gently, fondling them lovingly. Instead of me groping Sarah's big ass, I imagined Zoe playing with it, spreading it, slapping it. They had been so friendly with each other that my mind couldn't avoid thinking of them... Together.

I felt terribly guilty as jerked off and I pictured them naked, rubbing their sexy bodies together. How could I fantasize about another girl kissing my own girlfriend deeply, passionately? In my mind, Zoe explored all of Sarah's body with her hands, her fingers, and her mouth. Their tongues danced together, their boobs pressed together (Sarah's were evidently bigger), and their legs intertwined (Zoe's were evidently thicker).

No, I couldn't do that. They were just friends! I felt so dirty of thinking of them so disrespectfully! But I couldn't help it! My hand was moving faster too. Then the dream I'd had came into play too, and between Zoe's juicy thighs appeared a huge cock. It was double the length of mine, and easily more than twice my girth. And Sarah eagerly spread her legs, welcoming that huge, hard, throbbing futanari cock, and she screamed in pleasure as...

As I came. I shot two little spurts of semen which quickly went down the drain, and enjoyed a short but delicious climax for a little while. After that, only guilt remained. I pondered. Was I getting turned on just at the thought of them being normal friends? How could I get aroused at the idea of my girlfriend cheating on me with her friend?

No, it was definitely not that. I got aroused at the bodies of two sexy women, not the act of cheating.

Right?