As Mark talked a bit more with Aidan, not making any new changes for now, he saw that Aidan got more and more desperate and horny, but not once he tried to get Mark out of his flat. Feeling he should be a bit mean, he commented it with: “Are you okay? With how you are fidgeting around I would guess you need to use the bathroom? Before you make a mess because you don´t want to go there while I´m here, I will go home. I will leave what your teacher gave me for you right here.” Standing up, Mark slowly moved towards the door. “Get some more rest later, see you tomorrow. Bye Aidan.”
A last look towards Aidan showed Mark the tormented look in his eyes. Grinning, Mark left the flat.
Aidan was torn between his increasing need to suck himself, and the sudden need to both piss and shit outside. He only waited another minute to give Mark some time, before he quickly moved outside as well, nearly running into the park on the other side of the street to relieve himself.
Unbeknownst to him, Mark had gone into the park, hiding behind some trees, and watched Aidan doing his business. He laughed silently at the sight, and only left after Aidan had both relieved himself, as well as licked himself clean on both ends.
Back in his flat, Aidan quickly removed his jeans before dropping on the floor and begun to suck himself. As he was rather horny already, he quickly came, shooting masses of cum down his own throat, swallowing it down. Somehow, the taste remembered him of the smell his collar had. “Maybe a bit of my cum dropped onto my collar?” he thought to himself, but he couldn´t do anything about it. Soon after releasing his cum, Aidan went back to rest, quickly falling asleep.
Mark by now had also reached home, and made a small list what changes he would make to Aidan in the next few days until he would finish the whole process. He grinned at the result. Soon, Mark would have his new, loyal dog.