As Nate kept distracting his boyfriend with his boyish charms, Dave slowly bulked up. Rippling muscles with wide shoulders. Growing to two meters tall. (6'7") They were becoming the perfect size contrast couple they both craved. Even standing on the coffee table, Nate's subtly shrinking body was already at head height with his couch sitting boyfriend. At just 1 meter tall now, (3'3") Nate was literally half Dave's height, but their mass was many times different. According to the stats Nate had read on their final weights, Nate would only weight 16kg (35lbs), while Dave's hulking frame would weigh in at over 100 kg (220lbs). Dave was literally well over 6 times larger than him.
Nate's eyes fell to Dave's ever growing erection. It had reached it's beer-can-thick girth and 25cm (10") length. And the next strange was about to start, as it began getting even thicker, preparing to split into two equally as impressive cocks. Not wanting to spoil the surprise for his boyfriend, Nate quickly stepped off the coffee table, onto Dave's thick thigh, walking along it like a bridge to his love. Standing upright on Dave's thighs, Nate leaned in against his reclined daddy, coming literally only face to face with him.
"How's this for size contrast for you?" Nate said, planting a kiss on Dave's lips.
"It's perfect," Dave said, hungrily, kissing him back and letting his arms wonder across Nate's small body. His hands were literally large enough to tough finger to finger and thumb to thumb around Nate's waste.
"Well that's not all," Nate said mysteriously, slipping down from Dave's lap. Down his chizz led chest. Down his rippling 8-pack. Down until his cute face was nestled in between two enormous cocks. One cock in each of Nate's delicate little hands. Each cock too thick around for the boy to fully grip. He began to massage them lovingly, while kissing up and down, giving each eager by shy little licks. Precum was beginning to glisten at their ends. Nate lapped them up like forbidden candy, loving their salty flavor.
Dave could only steer at his dual cocks, and the adorable boyfriend playfully teasing them with his soft hands and wet lips. Each cock came with their own insatiable sex drive. Each one aching to blow its load into Nate. The duel sex drive, atop Nate's new form, lap dance and gentle licking was too much. He grabbed Nate by the hair and forced the right cock into Nate's mouth. Nate's jaw streatched wide to fit it, but he got no time to adjust. The cock head that had filled his entire mouth was pulled out and replaced by the left cock. This time it forced its way even deeper, making Nate gag a bit. Then he was again pulled back out as the right cock needed more attention, sliding fully down Nate's throat. Every thrust, the cocks switched place in Nate's throat. Every thrust, the cocks went deeper. Every thrust, the speed increased. Nate was soon swallowing each cock all the way down to the base, squishing his nose against Dave's pelvis.
Saliva and precum spilled down Nate's chin as he was relentlessly throat fucked harder and harder. His eyes rolled back as he was just used as a cock sleeve, barely allowed to gasp for air between the rapidly shifting cocks. Dave's stamina was insane, and he showed no sign of slowing down. Finally, after several minutes of relentless throat fucking, the first cock erupted down Nate's throat, filling him with so much cum that his belly expanded with the pressure. The second cock shot cum all over his face, hair and body. Dave fell back across the coffee table as the cum fountain kept hosing him down in a one man bukkake.
Nate burbled with bubbles through the cum filling his mouth and covering his face. He was exhausted. Totally spent. But satisfied. That had been the best blow job he'd ever given anyone, and pride welled inside him, knowing how much he'd just satisfied his boyfriend. But it seemed that Dave wasn't quite done with him yet.
Arms took hold of his limbs. One, two... three, four!? Nate looked up at Dave leaning over him. Four arms. Dave had four muscular arms. Had Nate done something wrong with the program? When he'd copy pasted Dave's cocks, had he accidentally duplicated his arms as well?
"I feel like I could keep going for hours more," Dave said, taking full control over his diminutive boyfriend. "But I'll let your throat take a break for a bit." Nate gasped as the first cock head pressed against his ass.