Love the mood, love the characters. And Staurt staring fixedly at his hand... I'm like Jay here, never done anything stronger than weed but I even that is enough to induce a previously unwarrented fascination with anything six inches from your nose. If I had only know about Fibonacci then, I'd have spent hours in contemplation of a pinecone or a seashell. But I digress...;-)
What you've done is presented most of the cast in a social situation, but really the only two who matter are Katie and Jay. The little bit of residual tension between them and Adam is good, his avoidance of eye contact. I love your descriptions of Jay being lost in thought, then his gaze refocusing. Almost nothing of their expression changes, yet somehow you know the different looking at them.
I've never dropped acid, either, but I've been around folks who have. It was always interesting to me how they became so immersed in looking at something, or touching it, for hours. Most of the time, all they said was, "Wow." *G*
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