I was at college and just started dating this girl when it happened.
We were in our first year at Uni (age 19) and there was this cute girl we both fancied. She wasn't stunning, but quite slutty and sexy and had small but pert pair of tits and always long nails. Basically you know she was quite an easy girl.
One afternoon we all sat together in the canteen and me and my mate both started saying how fit the girl was and that in an ideal world they'd have a threesome together.
The dirty slut replied half-jokingly: "you know guys we could go to the toilet right now" which we didn't expect. Not in such confident, outright terms!
We both got up at once and the girl exclaimed she couldn't believe this was being taken seriously. However, she obviously started feeling really randy and followed us to the lavs.
As we locked the door, she immediately unzipped my mate who who had a massive erection. I heard rumours he was big, but what I saw was unbelievable, seriously, my eyes (and hers) popped! His dick was like a drawing, incredibly thick, totally straight with a fat 'bellend' and very long, at least 8 inches.
The girl said "oh my god! you're huge!" and then started sucking it at the blink of an eye and then it suddenly occured to her that I was being left out. "Bless you", she said, as she noticed my erected knob out as well.
Trouble is, mine was so much smaller than my mate! Literally half the size both in length and girth. She said "Oh my god you're so much smaller than [my mate's name]!" and "It's so curly!" (as it's really very bendy), she licked it with her tongue stud a few times and started giggling and saying "Bless you. It's smaller than my hand". Then (and this is when my obsession with comparing began), she went "gowon, compare", she was obviously having a powertrip and i was already struggling not to come, purely for the way she was humiliating me. The difference between our cocks was staggering, she was obviously all over my mate, saying "I always fancied you" and constantly complimenting his cock each time she took a breath from sucking it. Which is why when women say "size doesnt matter" is utter bollocks. I can see why they say it, but it's a lie, plain and simple.
Then she turned over to me and said "Compare hands now!", in proper dominant style. My mate, who was as thin as me, had enormous hands whereas mine were the smallest out of all the blokes in my year, so you can imagine. She even started comparing hands with us, and while her hands were dwarfed by my mate's , her hands were clearly longer than mine, a fact made worse by the fact she had really long french manicured nails! I was mortified while she kept giggling "you're tiny all over!". My mate was obviously loving the power.
At that point, as I recall, she literally went for him, clearly turned on by how big he was, she was so loud!. I just contented myself with watching, she obviously just wasn't interested in me aside from scratching my cock (which was bursting that's how horny I was) with her index finger on the bit where it bends (I guess she was intrigued) while she was being fucked against the wall. I still remember she kept mumbling "I cant believe how much bigger than him you are", which was enough to make me come.
And her too...She climaxed right in front of us both, then she took her stuff and left in a hurry.
From that point on, she just wouldn;t leave my mate alone. A week later, at a party, she was all over him, they found a bedroom and shagged again. When I asked if I could get involved, she said, "no, [name of my mate] is big enough on his own".Then she turned round and said "How's the little curly thing?". It obviously made an impact too! he he