After lubricating Luke's ass with his own saliva as both Jake and enjoyex it, Jake failed to notice what was happening to his lower half with the snake tail Luke had put on him.
Once again he was putting on a second skin as the costume molded on his form, he began to look like a wolf-snake hybrid. His wolf cock entering the condom of the snake half forming a cloaca. A new bulbous snake penis emerged from the slit in the costume.
With no notice to his bottom snake half, Jake slithers upward and penetrates Luke, grabbing onto his new furry coyote back as he humps his newly transformed friend. As they were making love Jake's body starting receding into the tail, his fore legs getting shorter as his head sunk in.
"W-wait?! What's going on?" yelled Jake as his body completepy disappeared into the snake half of the costume, still humping Luke until he was completely fused with the long bottom half. The costume on it's own as if it was still controlled by Jake came inside Luke as it fell down.
Luke gave himself time to recover as he moaned from the fucking, his friend was now a snake tail for him to use, hopefully when the time expires he's back to normal. Luke stepped into the costume, bending down to grab it and pull it up to his waist, he lined it up and the tail already began attaching to his legs as he put his large coyote cock into the condom in the costume. Jake's added mass to the costume not only let Luke feel his tail, but any remaining mass spread evenly on his upper body in the form of muscle as his arms and chest bulked up. His tail finished forming as he looked in the mirror in his new, bulky coyote form. His new rattlesnake tail was a sight to behold as it was a good 10 feet long from his waist, ending in the titular rattle of a rattlesnake.
His new form wad very arousing to him as his snake prick emerged from his slit, infact it was more than one, he now had to snake dicks emerging from a single slit. Ignoring his arousal he emerged from the shower showing off his new form.
"So... what do you think?"