Stick to dry humping but don't say anything

Alex continued to saw his cock between your pussy lips, dragging deliciously against your clit. Several more times, you felt him pull back far enough for the tip of his dick to graze against your opening. Each time, a slight thrill coursed through your body. If either of you were to change your angle even slightly, this would turn into much more than just dry humping. But you didn't move and you didn't say anything.

Looking up, you noticed that Alex's face was starting to contort. He looked like he wasn't necessarily right about to cum, but also not terribly far off. Another minute or two of this and he'd be shooting his cum all over the place. A bead of sweat dripped off his brow and landed on your belly. You looked down and noticed the slick path his dick was leaving on your pubic mound.

Was that your juices, or his precum? Could that still get you pregnant? The thought terrified you and yet somehow it turned you on even further. Alex's dick once again bumped against your vagina, this time catching just a moment and popping the first inch or so inside before bouncing back out. His thrusts were getting more frantic. It bumped against your pussy a few more times, catching each time. Alex groaned... and suddenly you felt incredibly full.

Your pussy clamped down on the cock that had slid right inside, made easy by the incredible amount of lubrication. Your eyes wide, your mouth opened to warn Alex, but all that came out is a moan as your body was wracked with the most intense orgasm of your life. Your partner held himself deep inside of you and you felt his dick throb, a heat pulsing and radiating into your very core. As you both came down from your shared bliss, Alex looked down at you.

"Damn," he said, smiling, "I never knew dry humping could be so fucking good!"

You couldn't respond, struggling to cope with the fact that you just had an incredible orgasm, the fact that you're going to be a girl forever, the fact that you're going to be a mother, and so many other things flying through your mind simultaneously.

"What?" Alex asked, "It's not like you can get pregn-", he stopped mid-sentence as he feels you clench your pussy around him from the aftershock of your orgasm. He must not have even noticed that he slid inside of you before just then. He looked down at where you were joined and pulled out abruptly. "Shit! I didn't mean to! I swear!"