Shaking and breathing heavy mark turned toward Bryan who was at this point 80% dog only a few human features remained. Bryan’s canine cock fully erect out of its sheath desiring more of what it just received. Twitching every few seconds and jutting a lot of pre onto the hardwood.
The pain had distracted mark and as he witnessed the scene he once again felt a deep stirring in his groin a couple of small muscle spasms and his cock began to rise to attention out of his sheath.
Only one way to test this immunity he thought, he has to have sex and see if he transforms.
He approached Bryan who came up and lapped at his cock, he looked deep into his eyes and realized he didn’t notice any changing happening, he felt very good no pain, perhaps it was true!!!
He looked at Bryan and said hey buddy we are gonna try something different you may not like it, but it’s nessesary if you want to stay conscious and somewhat human it was almost as if the now most complete dog nodded, he grabbed Bryan by his hips and turned his rump to face him. Spit a little on his finger and pressed it to Bryan’s dime sized tail hole. Clean and smoothly his thumb popped right in and out. He smiles and lined up, he could sense Bryan tensing heavily and he calmed him by petting his sides he entered him as he climbed on top the two lovingly pressed together before mark began to take his job very seriously fucking Brian hard to attempt to pass of the immunity he reached down and grabbed his friends still erect canine cock and stroked it. Nnnngggh nnnggghh nnnngggghh Uuuhhhhhh Bryan and mark moaned, marks cheeks visibly red Bryan’s hidden from the fur was blushing also. Suddenly he let go of Bryan’s dick and grabbed hard on his hips thrusting majorly the last few humps, before collapsing on Bryan’s back pumping hot cum into him.
Fully extended inside Bryan knot and all he was pressing directly on his prostate, and with his dick twitching as he ejaculated he was stirring up something in Bryan who was just beginning to regain his voice as he absorbed the antibodies through his anal walls and his friends semen, woah woah what going on nnnngggg what is it doing, im cumming said mark no no like you don’t understand he said as his dick stood at end, knot and all fully extended began to twitch nnnnggghhhh uuuaaahhhh he kicked his legs slightly and turned back his head I can’t take it he said nnnnnnngggghhhhhhh wwwwwwaaaaaaaa he began shooting a huge load from his canine dick, only it didn’t stop and mark noticed his wasn’t either he was still cumming and his head was still swimming like he was, it was the longest orgasm of his life! He tried to pull out of his friend but found he couldn’t, as he fell he eventually found them both butt to butt his dick turned completely backwards, still pumping seed to his pleasure. But he collapsed with his face down ass up as he came until he felt very off suddenly and the pain began to return tho not at the same strength as before, he began to grow more hair and became 50-50 anthropomorphic dog boy, he now had a full tail but also the legs and buttox as a human but albeit covered in fur. He collapsed again going unconscious, this time when he woke up it had been hours, it was nighttime and his friend was sleeping directly beside him almost a spitting image only he had a white spot in his dark Carmel fur at his neck like a diamond. He slowly shook himself awake and went to look outside. Seeing nothing but his yard at night night but hearing many howls in the distance he thought they never should’ve fallen asleep! We have no idea how bad it is now.