Awesome! Thank you so much, not so mystery artist! This is an amazing gift!
There are so many things I love, where do I start? First of all, I adore you for bringing my prompt to life, to such an amazing life, filled with (self)hate, anger and despair. I'd like to say it's exactly what I imagined, but it is so much more.
The intensity of their looks. How the older Snape tries to force his will on his younger self, and how forcefully the younger resists. Hair, noses, the angle of the faces - your composition is perfect.
The color. The green tinge that lies on everything like a curse, the doom of the Dark Mark. Wow. I love the contrast of marked and blank arm and how the Mark looms to claim young Snape for itself.
The come. YAY! Thank you! Snape's hand is perfect. I love how he marks young Snape with his own come, and how the come resembles the Pensieve liquid. (My mind runs wild here. Maybe that's the answer how Snape managed to make the Pensieve work like that - by mixing Pensieve liquid with his come. ;)
The wonderful details. The veins on Snape's cock. The pubic hair. The structure of the wood. Light and shadows. How did you manage to get their hair greasy like that? The effect is gorgeous.