Last year, my sister invited my family to her house for the fourth of July. She had organised a traditional barbecue with backyard games and all the classics, and she prepared her spare bedroom so we could spend the night after the fireworks.
My wife, our children and I arrived by noon and rang the doorbell. My sister opened the door with her baby in her arms and a tired look on his face. She cheerfully greeted us and told our kids where their cousins were so they could go play, and then shot me a very serious look.
"George is in the back, getting everything ready. Let's see if you can put some sense in his head and convince him to change that ridiculous outfit". My sister said.
I left my wife and my sister in the kitchen making faces at the baby and I headed to the backyard wondering what kind of clothes my brother-in-law had worn to make my sister so upset with him. When I got outside, I caught him filling the inflatable pool with the hose. It didn't surprise me that his wife was angry. My brother-in-law was standing in the summer sun wearing nothing but a tiny swimsuit printed with the American flag that barely contained his enormous backside. He completed his outfit with some flip-flops a black backwards baseball cap and Ray-Ban Aviator sunglasses. His beefy back and thick legs glistened with sweat. My mouth went dry and I heavily swallowed. He looked hotter than I remembered. As soon as he saw me, he dropped the hose and ran to meet me. When he reached me, he gave me a big bear hug. I was quite a bit taller than him, but he still lifted me into the air and spun me around in his arms. He seemed genuinely happy to see me.
"What's up, brother! You look good! You've been hitting the gym?" He exclaimed.
I had been going to the gym, yes. I had a rather slender body and much less muscular than his, but it's true that I had managed to define my muscles quite a bit since the last time we had seen each other.
"Look who's talking! You're showing the fruit of your hard work at full display!" I teased him signaling to his husky body and rubbing the back of my hand over his wide furry chest. "Amanda seemed to really like the ensemble you've chosen for the occasion. Very patriotic."
"Ugh, I've already told her I'm not changing. I'm at my fucking house and it's hot as Satan's balls. I'm not going to put on a white shirt and khakis just to make her happy while I'm dying of heatstroke in a puddle of my own sweat." He complained.
I thought it was a good reason and I had no intention of arguing so I let it be. We started chatting about how was everything while moving furniture into place. After some time, our wives came out and we all chatted for a bit. Amanda tried again to convince George to change, this time looking for an ally in me, but it was futile. In fact, my brother in law remembered that he had a similar pair for me to wear. Amanda protested but my wife found it extremely funny so I went with it, knowing that I was out of trouble. We went into his bedroom so I could change. George rummaged through his drawers until he finally found it and handed it to me to try on. I held it out to examine it better and was pleased that it had a bit more fabric than his. They were swimming shorts that would reach a couple of inches below my butt and were much less tight. Without thinking twice, I undressed right there and put it on.
"Nice cock, bro," my brother-in-law said. I laughed because I assumed he was joking, but then he squeezed my package to check if the swimsuit fit well. "You filled them well. Especially on the front. You need to do more squats." Then he slapped my ass playfully.
We went outside again. I was sporting a semi that I could barely hide. My wife clapped when I appeared and my sister shot death rays from her eyes. To put some distance from us, she decided that it was time we started the grill while they prepared the salads in the kitchen. George was very particular with his grill so he didn't let me touch it. I just mixed the spices and sauces and enjoyed the view of my brother in law's backside. He turned to talk to me from time to time and every time I was staring at his flag covered ass salivating. I brought my sight up as quickly as possible but he smiled knowingly.
"You must be really enjoying the smell of the meat. You're practically drooling." He said. I nodded and agreed with him. "Or maybe you're hungry for something else?" He winked and pulled the elastic waistband of the speedo under his butt cheeks. His ass revealed pale and fuzzy. "Come have a taste of the burger buns." I wasn't gonna say no.
I kneeled behind him after confirming we were alone and dove between his glutes. I lapped his hole enjoying the ripe flavour of sweat mixed with the smokey aroma of the barbeque. He grunted as he enjoyed the rimjob and continued cooking the meat. I kept munching without a care when we heard the sliding door opening. I got up and pulled his swimsuit back in place. I just sat down on my chair when my wife appeared around the corner. I crossed my legs to hide the huge erection I was sporting. My wife was just checking how long until the meat was done. George talked with her trying to estimate an exact time and I noticed how he deliberately turned his back on her. My wife gave me a peck on the lips when the conversation was over and left us to our affairs, promising that we'd eat in ten minutes. As soon as she was out of sight, my brother in law turned around and showed me why he couldn't do that before. His dick has gotten so hard that it slipped through the limits of the tiny speedo and its whole head was showing, dripping clear precum against his thigh. To prevent awkward questions, he put on an apron that said "kiss the cook and continued grilling. I got up and placed myself behind him, making sure to press my boner against his ass.
"Kiss the cook, you say? Don't mind if I do". I whispered into his ear.
I kissed his neck and he left out a deep sigh. He leaned on me and moved his hips to meet mine. He turned his head and we made out with the sizzling noise of the grill as the soundtrack. My hands went under the apron and explored his throbbing boner. I scooped up a drop of his precum with my thumb and brought it to my mouth to taste it. It was thick and salty with a sweet touch. Completely different from mine. I found it delicious. We reluctantly got off each other and finished cooking our portion of the meal to join the rest of our family. During dinner, we kept stealing glances at each other, and my erection never subsided, so I wrapped a towel around my waist to hide it.
After finishing dinner, the women decided to assign us clean up duty while they entertained the kids. We tidied the table and brought the dishes to the kitchen where I began to wash them in the sink. My brother in law crouched beside me and pulled down my swimsuit to free my hard dick.
"I think I still have room for one last hot dog." And with that, he gobbled up my hog balls deep.
My legs weakened with the jolt of pleasure that ran through my spine and the plates on the sink clinked perilously. George gave me an enthusiastic blowjob while I soaped and rinsed. There was a window beside me where I could see our families playing and having fun. I felt a pang of guilt when my sister waved at me and I returned the greeting with a smile while my cock was being massaged by her husband's tonsils. Once I finished the dishes, I grabbed my brother in law's head and pushed my dick the deeper I could. He gasped for air when I released him and got up. We kissed quickly with an eye on the window and then, joined our wives outside.
"We're gonna be in my study. I want to show Al my new game set." My brother in law announced.
We rushed upstairs, ignoring my sister and wife’s complaints that the fireworks were about to start; we turned a deaf ear because what we had in mind was far more entertaining and exciting than a light show in the night sky. As soon as we reached the room, George closed the door and we were instantly naked, devouring each other’s mouths with unbridled passion. He opened a desk drawer and rummaged around until he pulled out a bottle of lubricant—which, he explained, he used to jerk off to porn during the rare moments he had to himself. He squeezed a generous dollop onto my steel-hard meat and then generously coated his hole. Resting his elbows on the desk, he arched his back and offered up his thick, fat ass; I couldn't hold back for even a second and aimed my missile straight at the target. The moment the head of my cock touched his entrance, I thrust decisively, burying my hard rod balls deep. He left out a deep grunt.
"Fuck yeah, man! Fuck me with that big dick!!" He moaned.
I delivered a series of long deep thrusts, reveling in the feeling of the walls of his tight hole caressing my prick every time I entred him. Every time my hipbone smacked against his ass, it sent ripples across his muscled glutes that got me hipnotized.
"God, I love your fat ass!" I exclaimed with my fingers dug into his hips. "It's so tight, it's squeezing me so good."
I felt that I wasn't gonna last too long after all our horny shenanigans during the afternoon, and the way his moans were growing higher-pitched left no doubt that he, too, was close. A bang from outside took my mind of that thought for a moment. The fireworks had started.
"Come by the window and fuck me harder stud." My brother in law said as he guided me by my cock.
We stood facing the window, looking out over the entire backyard. As I slid my erection back into his velvety depths, I could see our families enjoying the night’s spectacle. Fireworks lit up the night with color, the light spilling through the window and washing over our sweating bodies. A massive palm-tree-shaped firework illuminated the darkness just as my wife glanced toward the window; I waved and smiled at her while gently moving my hips to keep fucking my lover. I am certain that from below, we appeared to be nothing more than spectators enjoying the show, with the wall concealing the secret unfolding just below our waists. My wife waved back and turned her face away to keep watching the fireworks. As soon as I made sure no one was looking at us anymore, I grabbed George firmly by the shoulders and began thrusting hard. Given our position and the angle, my cock was pounding his prostate—blow after blow—turning him into a whimpering mess.
"Oh my god, YES!! Keep going! Im about to cum!" He shouted.
"Me too! You feel so good!!" I answered.
He gripped the window frame with both hands and I could feel his sphincter pulsing around my cock. I buried myself as deep as I could and began spurting hot loads of cum inside him while our bodies convulsed with pleasure. Our cries of lust were drowned out by the deafening noise of the fireworks' grand finale, and once silence reclaimed the night, we melted into a kiss as our breathing returned to normal and we recovered from the best orgasm of our lives. Our American-flag swim suits waited for us crumpled on the floor just steps away from our entwined bodies, witnesses of our forbidden affair.
