"Well, I actually do know why you're so small. But that's not important. What is important is that you're small enough to do... this." And with his last word, you found yourself at eye level with the top of Jacob's cock, the glans at least five times your size. Down below you saw the seemingly 50 foot long shaft, terminating in a set of gargantuan billiard sized balls that seemed to quiver with excitement. Each one was the size of a car to you, easily capable of holding you and several other little men your size prisoner for an extended stay.
"See my nuts? You're gonna be swimming in them in a minute. I've been looking forward to this since last night." With that, your legs began to be slid into the tip of Jacob's shaft. The flesh shuddered around you, pre leaking past your shins and then your thighs, lubricating your journey into your brother's depths. You were stone silent throughout the ordeal, terrified to speak out against the bizarre act that was being performed. Soon your arms were pinned to your sides, and as your nippers disappeared into Jacob's rod only your head and shoulders remained free. You looked up, your brother's smiling face being the last thing you saw before the cock spasmed around you, driving you deep into the urethra, one clench almost covering a third of the mighty length in one go.
It was hot and muggy in the meaty confines of Jacob's shaft. You could barely move, but at least you could breathe. The wet walls coddled you from all sides as you tried to struggle and squirm, but the only motion that actually had any effect was Jacob using a combination of tensing his groin muscles and stroking his shaft to pull you deeper into his domain. You could hear muffled laughter and moaning outside as the horny teen delighted in your presence. Slowly your descent continued, and Jacob's fingers brushed up against the bulge you made on the underside of his cock, squeezing you gently downward. Finally you arrived at another tube that seemed to enter into your brother's core, and the outward force disappeared. Only his contractions could move you any further. It was slow going, but eventually you were worked through the male anatomy, falling almost with surprise into an open orb like room, a a dimly lit pool of cum at the bottom to break your fall. Instantly the small space was made even smaller as the outlines of fingers invaded once more, the laughter turning more rapid as they sought out your tiny form in Jacob's massive right testicle.
"Fuck, that's awesome. I can even see the outlines of your body on the side of my sack. You're gonna be spending some time in there for the next three months Jason, that's for sure." His tone wasn't sinister like it was before, it seemed genuinely excited, as if you had given him a gift and he was grateful. And while you definitely didn't want to be in here for an extended period of time like your brother was suggesting, you had to admit that this wasn't nearly as bad as you had feared. After all, you had been rock hard yourself pretty much ever since Jason had cum on you earlier. Seeing no reason not to, you began to slowly work your own cock.
"Alright, now that you're locked away for the moment, I'm gonna..."