She pulled off her skirt and her own dick sprang up. She had apparently shaved it - and in an attempt to look somewhat feminine she had tied it up with a pretty bow. It looked cute, but it was also a little ridiculous. It also looked massive, your girlfriend was shorter than you so that made sense. Even if it was completely the same size as yours it was bound to look bigger compared to her smaller frame and because she actually shaved it off.
"Come here." You purred.
Your girlfriend bit her lip and approached you. You two sat nervously across from each other. She reached out to touch your cock and balls gingerly. Well, at least her hand job skills were decent. It felt like old times.
"Hey..." She said with husky lust in her voice, "Do you think... you can touch me?"
You gulped. Well, it was bound to happen eventually... you really did love her and you did want to give her pleasure.
You pulled her body close to yours. Now, you two sat cock to cock. Your girlfriend gasped in shock at your sudden move. You gripped both of your cocks at the same time and started to pump them together. The feeling of a warm hardening dick next to your own was... nice. It wasn't something you thought you'd ever feel.
Your girlfriend's dick was only half-hard but quickly grew and grew. It matched your own length but continued to engorge... and just edged you out by maybe half an inch. But that half an inch may as well be a mile. You were now definitively dating someone with a bigger cock than you. Still, it didn't bother you (in fact, in the back of your mind it kind of turned you on to be humiliated in this way. Your cock looked so small compared to hers). Your girlfriend started to dribble out some pre-cum as she gasped in pleasure and threw back her head. You tweaked her breasts as you pumped both your cocks together.
And then you both exploded simultaneously. Your girlfriend let out a deep, satisfied moan.
"That... was... amazing." She said panting, "I can't believe what I've been missing."
You chuckled, "Yeah a guy's orgasm is pretty powerful. Why did you think I got so horny all the time?"
Your girlfriend laughed as she looked at you. She grabbed your face and you two kissed. You could see her bright smile, you had made her very happy. You kissed her again as you got something to clean the both of you up.
--------
You two had basked for a bit in the after-glow when your girlfriend turned to you suddenly and stroked your arm.
"Hey... you know at first I was pretty upset about this whole thing." She said softly, "I was really scared that I was going to lose you. Between my parents... passing away this year and then being forced to have a dick - I didn't know what I would have done if you had to break up with me because of this..."
"It's okay, babe." You whisper back, "I really do love you. I would never let anything like that get between us. Besides, it'll give you a little perspective in what it's like for a guy I guess."
She laughed, "I love you. Seriously. Now, shouldn't you be getting home?"
You nodded. You got dressed and packed up and headed out.
When you got home...