This year my day is the Saturday and we take turns yearly as to who`s first hers naturally this year is the Sunday. Now that all may seem like a good ...sexy idea but it can lead to some bizarre happenings and fall-out or aftertaste, we have been together 7 years now and we have had 4 birthdays using this method since we started to become shall we say sexually adventurous. The first year was pretty tame, just swapping with our friends for the weekend, which as the lady I ended up with, was a. Being the older one by a year, Grover had to give up his childhoold fun when they were thirteen because their parents died of a car crash. He managed to teach Alex everything he knew about nature. Which, was the only thing they had since they had no family members left. Alex learned quickly and somehow knew more about it than Grover. They took shelter in a small abandoned three room house in the forest near our school.A bathroom, kitchen, and bedroom. I halped them fix it along with some other. Indeed, at 7.5 inches, I was larger than the typical guys I had been with."I'm not." He said. There was an awkward pause before he continued with a smirk, "I have huge cock." This peaked my interest, as my disappointment with his stature subsided a little.We got to the club, and had only one drink before he said rather adamantly, "Let's go to your place." I texted my roommate to let him know I as bringing someone home and we made the drive back to my place.Entering my room, he took off his. V. I FELT IT WAS SAFE ENOUGH TO HAVE A GO. SO I WHIPPED OFF MY UNDIES AND SLIPPED ON MY sister’S PANTIES. NOW, I HAD SNIFFED, CARESSED AND RUBBED THESE AND OTHER PANTIES AGAINST MY COCK OVER THE PAST FEW WEEKS, BUT NOTHING HAD PREPARED ME FOR THE SENSATION I FELT WHEN I WAS WEARING THEM FOR THE FIRST TIME. I GOT AN INSTANT ERECTION THAT WAS SO STIFF THAT I THOUGHT MY FORESKIN WAS GOING TO RIP APART. I DIDN’T MASTURBATE, RUB OR CARESS MY COCK, BUT AFTER A FEW SECONDS MY COCK HAD AN UNCONTROLLED.