That was a mistake on my part. By squeezing my thighs around his erection, I hadn't counted on the friction slowly and steadily stimulating him to a full-blown erection. All the while we were chatting and attending to the guests at the door, we were somewhat successful in mentally blocking out the situation below.

However, it did make it very awkward for us to speak to each other even though we were stuck together in the same costume. By the time all our guests had arrived and settled, I found myself standing at the door with his obvious, full erection caught between my inner thighs and shorts.

There was no way to ignore it now, as every step we took only served to rub his manhood below me. Now that we were finally alone, I whispered to him without turning around, "Erm... Max, why don't we go upstairs to change? It is really too hot in here. I'm sure the guests won't mind if we just wear normal clothes for the rest of the party."

He replied, "Oh... okay Zeh, I need to go to the toilet also. High tide, haha..."

We took short and slow steps toward the stairs. When we came to it, my greatest fear came true as soon as we made the first step on it. When we both lifted our right legs, that move spread the spacious leg opening of my shorts and his full erection slipped into my shorts.

The tip of his full-blooded dick was poking on the front of my FBT shorts. Worse was the shameful fact that I could feel him on my naked slit, my strands of pubic hair tickling his hardness. We immediately froze on the stairs, not daring to take another step.

Just then, a kid of our parents' friends laughed at our weird posture on the stairs and drew attention among some of the other kids. They gathered around us and started hugging and pushing. We could only laugh and giggle with them awkwardly. We were stuck. We could not move from here and their pushing and shoving were making us rub against each other.

One fat boy ran at full speed and bumped into us from behind. We bent forward and almost tumbled face first. In reflex, I stumbled my front right foot a step forward and we had to put it a step higher on the stairs. Now, I had spread our legs even wider and the angle we ended up with was just horrible. Max's dick was now in contact with my sensitive button as I had spread my lips wide open below.

We had to get upstairs and shed the costume urgently, for I was afraid that I would get stimulated as well. As the kids were still running around us playing, Max heaved and managed to lift our left foot a step up. As the angle of our thighs closed, I hadn't counted on his erection pushing between my dry lips and directly against my clit.

I couldn't help but let out a moan. When Max heard me, I could feel his dick twitch below me. That little prick had better not be enjoying this, I exasperatedly thought to myself. This wasn't the time for me to lecture him on his pubescent urges. I just wanted to get out of this increasingly desperate and dangerous situation.

I lifted my left leg and took another step up. His erection slid backward between my dry female lips and then bumped on my clit again. This time, a shock of pleasure electrocuted me. I squirmed in the costume and unfortunately rubbed my slit even more on his hard dick.

In just a few seconds, a hint of moisture was starting to form below me. At first, I thought it was him. But I was wrong. My lips were getting wet from the constant contact of my naked female slit with his erect dick. Things were not working in my favor, as Max was starting to lose control and slowly grinding himself under me. I whispered to him embarrassingly, "Stop it, Max. You're making things worse. Control yourself."

He did not reply to me. All he did was continue to grind his erection below. His breathing was getting loud and lustful. I realized then that I could not depend on him anymore. I took another step up with my right foot and again, he rubbed at the entrance of my dampening slit.

My knees almost buckled and I got angry this time. We were not even halfway up the stairs. I reached back with my right hand and hit him on his side, telling him to wake up from his lust and come back to his senses. I could not do this alone with him relentlessly gyrating and grinding himself on my pussy.

But I hardly caused him any hurt through the thick costume. Suddenly, a voice called out from behind us; it was my stepmom. Max finally snapped out of his lust when he heard his mom calling. She was rushing to fill the food plates and finally caught sight of us making our way slowly up the stairs.

We looked like we were having some problems, so she asked if we needed help. I just told her I was having some cramps and needed to rest upstairs. She didn't suspect a thing, but it made me realize that we were drawing unwanted attention.

As soon as she walked away, I said to Max threateningly, "You better cooperate with me, or YOU are going to get into so much trouble, young man!" He finally got the message and replied from behind, "Sorry, Zeh, I don’t know what came over me. This is really embarrassing… let’s get upstairs quick, I mean it. I’m sorry, Zeh..."

Never in my life had I encountered such an awkward circumstance, and I was determined not to let my younger brother do this to me. We took another step with our left feet. His still-erected dick rubbed me thoroughly between my wet lips, sliding from just below my anus to my bush in front.

Although that was unintentional on his part, God, I really could do without any further stimulation. More pressingly, I was so afraid he was going to penetrate me. Then we took another step with our right feet. His irritating erection pressed then spread my moist girly lips and slid in between my folds, very nearly penetrating my slit before bumping into my clit.

I almost let out a soft girlish moan again, but I bit down hard on my lips. If he heard that, his hormones would take over again. We were now halfway up those damn stairs. Each step up the stairs seemed to be getting more dangerous for me, as my pussy was getting progressively more vulnerable to the invasion by his erected dick.

"Max… be careful. You’re… you’re bumping into me…" I said as we prepared to take another step. He nervously replied, "I… I know, Zeh… I can’t help it. I’ll try to bend lower." And he bent as much as he could at his knees within the constraints of the costume, thinking that would lessen the contact between our genitals.

That was the worst blunder we could have made. From his bent knees, he dipped himself lower behind me and his erected manhood slid back from against my clit and pointed directly at my female opening from under me. When we lifted our left legs to take another step up, I could feel his tip shockingly poised for entry into my womanly depths.

I immediately tried to stop him from lifting himself from that step, "Max! Stop. Stop right there. I… I can feel you… nooo… stop! Noooo!"

It was too late. He couldn’t react fast enough to my warnings. He reflexively tried to take one more step and lifted both of us up the stairs. His tip pressed against my slit and breached its defenses.

I reached both hands behind me instinctively, pressing hard on his sides as I tried to stop him in his tracks. But there was nothing I could do. I felt him enter and slip a couple of inches into my hot opening as I gave out a small involuntary gasp.

"Sorry, Zeh! I… I didn’t mean it… I swear to God! I didn’t mean it. I’m so sorry!" But the damage had already been done. My god, it had been so long since I had one of those in me. Although I wasn’t a virgin, Max really surprised me with his length and girth. He was definitely bigger than any of my ex-boyfriends. Even though it was just a couple of inches, I could feel his meat shaft stretching my lips and insides.

My lips were only fairly moist due to the earlier stimulation, and my pussy depths were still relatively dry. I could feel a dull ache down there as the tight costume trapped his tip in my pussy. It was impossible for him to take his cock out now, but we could try and prevent the situation from getting worse. And I feared I would get more aroused with each passing second with his hard tip forcefully spreading my vaginal folds.

I tried to sound as composed as I could as I said, "It’s… it’s okay… Zeh is alright… just… don’t move… until I’m ready…" Wary that he might accidentally plunge deeper in, I raised myself on my toes and bent forward as much as I could.

My butt pushed higher against him, shifting the pressure from his crotch to his tummy. I had to use my arms to support my upper body weight on the stair railing while Max remained scooted behind me. My whole body broke out in even more sweat as I propped myself in this strenuous position.

I could feel his hot cock lodged menacingly just inside of my pussy folds, threatening to force into me if I let my guard down. There was no time to lose. I initiated the next step with my left foot and led Max to follow suit behind me. When we put our feet down, all was well. But when we lifted ourselves up, his cock pulled out an inch and then drove itself back in.

I whimpered loudly as I felt his cock slide out and fuck itself into my sensitive female opening again. I hoped he didn’t hear that. My arms were shivering on the railing as my pussy spasmed and squeezed on his cock uncontrollably.

Although he was still about 2 inches in me, he was making me seriously wet. As if his cock triggered my pussy’s natural defenses, my juices were starting to flow in response to his sudden withdrawal and forced dry entry. I grit my teeth and put up with the overwhelming sensations below as I prepare to take another step up.

There were only 4 more agonizing steps to go, and I was determined to see us through this ordeal. Even though we coordinated our steps, we could not totally synchronize our movements in the suit. I was aware that with every step we took, his cock would move within the depths of my hot and rapidly dampening pussy.

When we took the next step, the same thing happened. More specifically, I could feel my pussy dragging along the length of his hard shaft as his cock slid inside me. An inch out, an inch in. I could also feel my taut pussy lips around his girth getting wet as it tried to accommodate him, my juices ironically coating his cock to make it easier for it to fuck me. Although we were moving at a snail's pace, I was getting out of breath, and so was he.