Two more rounds

For the next 2 fucking rounds, it had gone pretty much the same: the both of you alternatively riding and sucking your partners, the both of them thoroughly enjoying, though one of them clearly enjoying more than the other. You were impressed with both of their staying power, but especially Dereck's: between your impossibly tight pussy and Tanya's serious oral skills, you had expected him to last a lot less time then he was doing. After the third round, you could obviously start to see the telltale sings that he was slowly getting there, but still, he was doing a really good job.

As for the girls, Tanya and yourself were clearly enjoying yourselves too. You had also noticed that Tanya was riding Sean harder and with more abandon than you were Dereck. Perhaps she was so confident in here advantage that she didn't feel the need to hold back while fucking. On one hand that gave you a little bit of hope that she would maybe overdo it and ride the cum out of Sean. On the other, Dereck was clearly getting in a more advanced state of arousal than Sean. Perhaps Tanya was had simply decided she knew she would win and she wanted to enjoy that cock as much as she could.

As for you, you were getting more and more aroused with each round, getting closer to cumming yourself. That girth from Dereck's beautiful cock coupled with the wonderful feeling of fucking a bareback cock were getting to you. Add to that the dangerous load the cock could deliver, and the thrilling risk of pregnancy that came with it, and you were getting pretty wound up. Even if the risk was pretty small right now, it was still there and, you being new to it all, you were still scared of the possible repercussions.

You could see where this was going. Dereck was getting closer, and so were you. You knew from porn and erotica and girls gossiping and boys bragging that the one thing that felt better for a guy than to fuck a nice, wet, tight pussy was to have that pussy orgasming on their cock. The writhing, the twitching, the squeezing was apparently enough to push most men over the edge on the spot. That meant you couldn't let yourself cum. Since Dereck was already getting close, you needed to hold back your orgasm. Your best chance at winning this was to not cum and wait for Tanya to cum on Sean, probably pushing him over the edge. She was already riding him pretty hard, she must be getting close too. That was your window.

You glanced at the clock: about 1:30 min left of fucking before going back to sucking. That cock inside you was pushing you closer and closer with every bounce you did on him, but you were determined to hold back and prevent yourself from reaching that orgasm. For the past minute or so, you had felt that familiar pressure building in your lower belly, indicating your orgasm was building. At the same time, you noticed something new: a new movement you hadn't felt before. It was quick and subtle: you weren't even sure you had really felt it or just imagined it. It had felt really good though. A couple of seconds later, you felt it again: a twitch. Dereck's cock had twitched inside you.

You looked at his face: his eyes were closed, his jaw was stiff and there were beads of sweat of his forehead. He was getting there too. Another twitch, this time more powerful. And again a new sensation: the friction and pleasure intensified. It seemed your pussy had gotten tighter. With each twitch, you could feel his cock start to expand a bit. He was also getting harder. He clearly was getting really close. And it felt amazing: so were you.

45 seconds left

"I must not cum! I must not cum! I must not cum!" you were saying in your head on each down stroke. You were doing your best to hold it in, squeezing hard against your own twitching pussy to keep the pressure in check. What you weren't thinking about was that by holding back so much, you were tightening your pussy around him, squeezing his cock with your vaginal muscles, making it even more pleasurable for him.

15 seconds

"Almost there! Almost there" Again with each delicious downstroke. He was now twitching like crazy, and his cock was as hard as could be.