Scott pulled back the covers as he heard Don come back in the room and lock the door. He thought about asking who was there, but instead he waved his roommate over, stuttering out "C -- Come here," in between the shivvers that gripped and shrank his hairy body. Soon Don was standing at the edge of the bed, and Scott went straight for the crotch of Don's jeans, yanking the fly open and pulling on Don's underwear, even as he felt it slide in his shrinking hands. "Give me your dick, Don." Scott said hungrilly.
Don watched the sex-crazed spectacle for a moment, and then replied, "OK, ok, tiger. Slow down for a minute and it will be better." Scott withdrew as Don started to toss off his clothes. Scott threw the covers to one side and slid down on the oversized bunk. Don could see that his friend had started shrinking again, and his little dick seemed to be at full-tilt already.
Scott waited impatiently, rubbing his hands through the fur on his chest, and then along his sides as Don finished getting undressed. "Ok," Scott said before Don had completely finished. "Kneel down up here and put that big cock in my face." He guestured for Don to kneel facing Scott's feet, and Don got into position, his balls resting on Scott's head. Naturally, Don wrapped one fist around Scott's throbbing shaft but the smaller man said, "You can hold on, but don't stroke me. I don't want to cum yet."
Don was surprised at his roommate's sudden bossiness, but as small hands, lips, and a tongue went to work on his dick all that was quickly forgotten. He rubbed Scott's fading balls with one hand while his other held the man's shortening rod. It twiched by itself, and each twich heralded an even greater reduction in his partner than the last.
For his part, Scott was completely blissed out. Don's dick had started out at around 8 of his altered inches, and it was growing steadly -- and faster. He couldn't get much more than the swelling tip in his mouth, so he didn't try. With his arms he alternately worked Don's swelling shaft, now edging past 9 inches. Occasionally, he allowed his hands to drift back to Don's overstuffed ballsack, hanging down more bulbously with each passing minute.
Scott felt his feet sliding along the bed, eagerly trying to telescope up into his groin. His head was held in place by Don's knees, and as his whole body moved, it vibrated in unison with his straining dick. He could feel Don's fist growing more cavernous around his cock as it shrank to smaller and smaller sizes. Big fingers probed his balls as they dwindled away, getting smaller by the second.
As Scott pulled Don's 10-inch schlong downward, he rubbed his face along its smooth surface. It was like his whole body was one big penis, being stroked as it shrank. As he wrapped both arms around Don's big slab of meat and pushed his little face against the soft flesh of his roommates balls, Scott could not think of anything he would rather do than keep on shrinking.
Don felt the unmistakeable changes in his partner, as the shrinking picked up speed. The little dick started to twitch in his hand and then retracted sharply as Don watched arms, legs, and the rest of Scott's body shake and shrink, shorter, thinner, smaller.
Scott felt his new love, Don's hard dick, growing. His whole body was shaking as he jacked his partner's lengthening member for all his little body was worth. 11 inches came and went, and then 12. Scott's whole body felt like it was ejaculating as Don stretched out to 13 and then 14 of his inches. He rubbed his head against Don's tight nutsack, feeling it spread out as it grew.
Just as Scott's own orgasm was ebbing, something he was doing managed to push Don over the edge. Scott kept the stroking up as Don's firehose erupted against Scott's hairy pecs, spewing hot cum across the remainder of his shrunken body. Don let go of Scott's dick to brace himself against the wall as shot after shot unloaded on his little friend.
Scott stayed completely hard the whole time as he was coated in Don's seed. Don's pipe grew another inch as Scott patiently serviced each and every tingling spurt.
After half a minute, Don stood up and went for a towel. He turned back to Scott to find the tiny man still masturbating, his ever-hard dick in hand. The little creature moaned as Don rubbed the towel over the wet bear, wiping up the cum he could. Then with a lick to what was left of Scott's balls, Don sent his roommate over the edge again.
Don watched his friend shrink again, each dick-spasm directly linked with a size-reduction. The stronger the spasm, the greater the shrink. Finally, the little man's body came to rest at something less than two feet, and he went limp, having lost consciousness. Although Scott had not come to his senses, Don was starting to get concerned.