You're my boyfriend and you decide to surprise me with some new panties. I'm so excited as I take them out of the package, but I think you've made a mistake. These aren't panties, these are men's boxer briefs! You must have ordered them by accident. You encourage me to try them on anyway, so I do and I find that I actually really like them. They are so cute and comfortable. And strangely... they make me REALLY horny. I figure you won't mind if I touch myself in them, so I start rubbing one out through my new underwear. But after a few minutes of touching myself something bizarre begins to h...

You're my boyfriend and you decide to surprise me with some new panties. I'm so excited as I take them out of the package, but I think you've made a mistake. These aren't panties, these are men's boxer briefs! You must have ordered them by accident. You encourage me to try them on anyway, so I do and I find that I actually really like them. They are so cute and comfortable. And strangely... they make me REALLY horny. I figure you won't mind if I touch myself in them, so I start rubbing one out through my new underwear. But after a few minutes of touching myself something bizarre begins to happen. There is a bulge in the front of my underwear. I'm shocked to discover that I have grown a huge cock! I start to freak out, but you assure me that everything is okay. That everything is going according to plan. You see, you've always had a thing for futanari. That is, girls who grow dicks. So you bought these enchanted panties to do just that to your girlfriend. I can't believe this! But you promise me this is your biggest fantasy, so I decide to go along with it so long as I can change back to normal later. We start by stroking our big cocks together. It feels amazing! I had no idea having a cock would feel this good. Next you ask if you could suck on my cock, and I moan loudly as you take my girth into your mouth. We're both so horny and worked up, I ask you to fuck me in the ass. My new cock and balls bounce with every thrust as you fuck me from behind and it feels amazing. Then you fuck me on my back with my legs up so you can watch me stroke my new cock and balls while you fuck me. I confess just how much I love this, and I'm actually glad you tricked me into becoming a futa girl. I never want to go back! Finally both of us cum hard together, I drench my belly and chest in my own cum, while you leave a huge creampie in my asshole. But even after all of that, I'm still hard. So why don't we take a little break and then go for round 2?!