You're still making up your mind when Brock turns his attention to you. His face is still down near your foot, kissing it, but his eyes are fixed on you. He tilts his head up a little. "Do you have a condom, sir?" That makes you smile. He's still addressing you politely, even in the bedroom. That's amazing customer service. "For me or for you? You look like you wouldn't fit in mine." You gesture with your chin (which feels a little saggier and less defined, you notice) towards his obscene bulge. He pulls his dick out for you to see. It's giant; definitely the biggest one you've ever seen in real life. Is it 11 inches? Brock is uncircumcised, but his arousal has the head of his dick poking slightly out of the foreskin, purple and wet. He's already got sticky precum dripping from the top of his dick, glistening in the afternoon sun. "It's okay," Brock says, although you have to admit his words don't register for a second. To say you're distracted would be an understatement. "I want you to be inside me. I don't usually bottom, but usually whoever I'm with isn't usually as handsome as you. Not as manly." He pulls his boxers down for you, revealing a pert, round ass. It's the only part of him that isn't pleasantly tanned; to you it looks like he sits out in the sun wearing nothing but swim briefs. His glutes are muscular, but still manage to have a little fat, enough to give his behind a round, enticing appearance. He must do a lot of squats, you think to yourself. The delivery guy lays down on his stomach.
Brock is looking back at you, over his shoulder. You take off your boxers and let your dick spring loose. With the small boost of your added age, you're a solid 6.5". Emphasis on solid. Disappointment flashes in Brock's eyes. Your tool must look small next to the footlong sub he's sporting. "Do you wish it was bigger?" The question sounds defensive as you speak it. "You're enough stud for me," he says, but you know what that means. You feel something fiery in you. Lust, but also a little embarrasment and anger. "I can make it bigger. Just tell me that's what you really want." Brock looks a little confused. "You can make it bigger?" "I said that already, didn't I? I just need you to tell me that's what you want. And I need you to give me a condom. A big one." Brock looks like he's enjoying your more dominant approach, but is obviously a little off-put by your seemingly delusional claim. "Are we roleplaying? Well, okay. Yeah. Yeah, I would like your dick to be bigger."
You smile and wink at him. "Your wish is my command. Now where's that condom?" Brock gestures to his uniform, crumpled on the floor. "In my wallet." You take out the leather billfold and quickly locate a magnum condom. You start to roll it over your dick. There's quite a lot of overhang. You push the delivery guy's back down firmly with one hand. It has the intended effect; he lays flat, his head facing forwards. Away from the magic you're about to perform. You quickly kiss the ring, thinking of Brock's dick.
Instantly, you feel a surge of raw arousal. Your dick feels huge. Looking down, it is. It's veiny, a feature that you find simultaneously unsightly and arousing. You give yourself and Brock a quick once over, not noticing anything else changed. Brock has certainly noticed something is different, though. You'll have figure out what else has switched later. You flip the young man over and pull him by the thighs close to you. He looks at your crotch, your huge cock jutting forward. Formerly his. His mouth is agape. He looks down, and sees his changed penis; smaller, less wide. "What? My dick!" You smile. "No, THIS dick belongs to a man. That," you say, pointing to your former equipment, "is for a boy like you." That works like a charm. Brock is gushing precum from his shrunken equipment. "You're going to give it back, right? After this?" You smile a little. "I'm going to give it to you right now."
You grab his thighs tighter, pulling him against you in time with your thrusts. Brock is no longer looking at you. His head is tilted back, eyes rolled up, clearly in ecstasy. You feel pretty good too. Your new dick is firing waves of raw pleasure into your brain at levels you would never have thought possible. And you feel strong, manly. Big. The age difference is a part of that. Sure, you're not as toned as Brock, but you feel good, like you're in control. The sag in your gut, the extra hairs, they just add to your virility. Brock is starting to sweat a little, and his moans are rising in volume.
You catch a whiff of him, and feel strangely turned on. While you pump into his firm butt, you move your mouth up his thighs. Tiny droplets of sweat on his tan skin wick away when your lips make contact. You kiss up his legs roughly, and get to his feet. They're small, or they feel small compared to your massive extremities. Brock's feet are calloused and smell a little, but what surprises you most is that they turn you on. A lot. You're pumping faster now, and start licking Brock's feet. You can't stop yourself. "Oh my fucking god. Mr. [name]...." You cum, feeling the condom fill up. The replete latex puts pressure against the tip of your enormous dick. Brock shoots too; his smaller size not reducing his eruption. Thick strings hit him in the neck and face. You pull out, and catch your breath. It's a little ragged. Your older body isn't used to this exertion.
Your thoughts catch up to you; you realize what else must have changed. Brock was all over your feet a few minutes ago, and now here you are, cumming HARD when you catch sight of his. Even thinking of your own clownish feet makes your cock slap lazily against your leg. You must have switched fetishes with Brock. Well, in truth, "switched" is a bit of a stretch. You've always been vanilla, and had absolutely no preferences that would be considered unique or abnormal. You turn your attention back to Brock, who is coming down from his orgasm. He collects himself, and he sits up. His brow is furrowed on his handsome, youthful face. But what does he say?