Engaged and Experimenting

I’m thirty-five now, engaged to this amazing guy named James who’s got the patience of a saint. We’ve been together for five years, and he knows me better than anyone, or so I thought until last weekend. So we’re at our friend’s cabin for the weekend with a couple other friends. My fiancé James has known since day one that I’m bi, but we’ve never explored my poly side as far as dating goes, just some threesome fantasies. So there's this girl named Mia, who's in her early thirties and she’s gorgeous. We all know each other from work, same department, not a lot of LGBTQ+ friendly places where I live. Anyway, James has this rule about me always using protection for PIV sex until we’re married, which is fair enough since he knows I’m still exploring my kinks on the side and whatnot. But with Mia, it was different from day one. We agreed she’d use her birth control, but to be safe, I brought along some extra condoms too. It all started innocent enough. We were drinking a bit too much, talking, laughing. Then James left us alone for like ten minutes to get more beer. Next thing you know, Mia’s on top of me in my bed with her legs spread wide and one of those little satin ties I love so much from a drawer around my wrist, pulling my hands down by the headboard. I told her how wet I was, she knows how sensitive I am about that. She went straight to work teasing my clit until it felt like fireworks were going off behind my eyes every time her fingers moved against me. And then when she pulled back just a bit, I could feel her slickness on my inner thighs and she guided herself onto me in one smooth, deep thrust. Mia’s got this long hair that falls around her face when she moves above me, it was like being trapped in the most beautiful nightmare you’ve ever had. James walked back into the room just as she leaned down to kiss me hard, breasts pressing against my chest and her hips grinding on top of mine. She pulled away with a wicked grin, looked at him, then whispered in my ear that we were both going to be so tight for her soon. James was shocked at first, I could see it in his eyes. But the more Mia kissed me and slid down over me until only my clit was left exposed, circling it with one finger before pressing a kiss there too, he relaxed into it. I was so wet, just from looking at them together like this. So we finished off that night, all three of us in bed with her riding me hard while James watched and then joined in soon after to finish things up, and it felt better than anything I've ever experienced before.