"I need to say goodbye while I still have my mind" Greg told himself as he ran into the room Jeff entered
"Dude! did you find the stairs?" Jeff exclaimed as he saw Greg catching his breath.
"No dude... god...." Greg said, panting. "I... I.. I'm infected!" He shouted as he picked up his head to look Jeff straight in the eyes; pointing at the droplet of cum on his cheek.
Jeff stood there dumbfounded for a second... was this a shitty prank? no... when things got serious he knew Greg well enough that he wouldn't joke like that. All he could say in response was "Oh my god..."
"I... I don't know how much longer I have... but I had to say goodbye..." Greg said almost weeping; but as he turned around to exit, something grabbed his arm. It was Jeff?
Looking back at him, Jeff had a serious, stern look on his face. "Dude. We do everything together." he said, reaching out with his other hand; "Even this." Jeff proceeded to wipe the coagulated cum off of Greg's cheek, and wiped it onto his own.
"Wh-What???" Greg was was shocked. Shocked, but also, happy? He knew he didn't have to leave Jeff anymore... but...
Jeff closed and locked the door, and rejoined Greg who had sat down on the couch. The small amount of cum that landed on him delayed the initial rate of infection, but now he was starting to feel it. His body began to feel like it was heating up, and his thoughts were starting to get a little hazy. "I-it's starting! I-i'm burning!" was all Greg managed to say before he started yanking off his clothes in a desperate attempt to cool down.
Jeff watched his best friend, his partner, and decided to join him; throwing his own clothes off. The virus hadn't really started effecting him yet, but he could feel some urges building inside him. "We do everything together..." he said standing up; he then grabbed Greg's arm and pulled him off the couch. Greg's eyes fixated on Jeff's gaze as he was pulled in; their hairless chests now pressing against each other, with their nipples perfectly aligned.
"... even each other"
Both of them felt a tingling as their nipples pressed into each other; areolas expanding, pressure building. Breasts began to form on both of them as they watched, panting together, pressing harder, moaning slightly. Their faces had already taken a softer form, while still looking like themselves; their cheeks had rounded out more, and their facial hair had receded. Looking at each other, they both leaned their faces in, and started making out as their bodies continued to shift. Their forms taking on a more androgynous look, if they hadn't both grown sizable boobs anyway; as they kept on grinding their bodies against each other and sliding their tongues back and forth between mouths.
Tension in their dicks, seemlingly untouched by the virus beyond their pubic hair mostly falling out, began to rise as they broke from their extended make out session. Looking down, they both realized the other was feeling the same way; so they ran to one of the beds and laid down at opposite ends. Without any other words, they grabbed each other's big butt and pulled the other's dick into their mouths; causing them both to unload simultaneously.
The two of them had been inseparable for longer than they could remember, and now it'll stay that way forever.