I've been thinking about the mom of one of the kids that my kid went to daycare with. Her Halloween costume involved her getting bangs, and normally that doesn't work for me, but she pulled it the fuck off. Got me hard pretty instantly seeing her in a couple of pictures. She is not really anything special naturally - an above average looking mom, but nothing too crazy - but she's so ridiculously pretty when she tries.
She and I have always had a little flirty of a relationship in the short time we've known each other, and my wife wants to spend more time with her and her family, so I just can't help but imagine taking a short little vacation with them. Fantasizing about coming out of a bedroom, changed for the night into my grey sweatpants, and bulging ridiculously after pumping my dick for a while so it is absolutely unavoidable for her to see it and get curious. Ending with my cock slapping her face and filling her up. I'll probably actually try to find a time to "innocently" or "accidentally" show off my cock to her like that - I assume it won't end in sex, but hey, if my wife allows it...
Gotta revise and replace her with someone else. But it might be off-topic - the new fantasy is not in my life currently, but she used to be and easily could be again lol
I posted earlier today about a girl I fucked in college. A hot, busty, petite Asian girl I worked with and secretly (well, secretly from our coworkers and friends, not from my neighbors

) fucked off and on for a few years. Posting the story about her got me thinking about her and looking at a few old pics, and my god I can't get her out of my head right now!
One moment in particular is stuck in my head, because I looked back at this one pic I have of her undressing in my apartment bedroom. I was already in bed that night. She was out at bars with friends. But we were sexting a bit until I told her I was going to sleep...but I'd leave the door open and I'd be naked. Sure enough, a few hours later, she came over to my place and started getting naked immediately, but she had no idea I woke up when she came in. She didn't know I was already awake and rock hard. So I turned the light on to surprise her when she was undressing, and she started laughing like she was "caught." But then as she was dropping the bra, she was really caught: I threw off my covers to let her see that I was ready for her, and I snapped a pic of her. It was the perfect picture to capture the moment: She was looking down at my cock pointed to the ceiling, her perfect tits on full display, and she was smiling such a big, excited smile, as if she was saying "Oh my god I'm so lucky to have this thing all to myself!"
I know if my wife would let me fuck one other person, she'd be my choice. She wasn't even my "second favorite" partner after my wife. Not even the third. Probably tied for fourth. But, there could easily be no emotional impact for either of us, and that's a big thing. And I really, REALLY want to duplicate that moment when she was so excited to see my hard cock, but this time with my cock pumped to 7 inches girth
