So I just did Twilight again. This time I felt EVERYTHING;the hooves, the "plot", the leg-widening, the horn, nuzzle, ears, mane and everything. This time I put a black blanket over my eyes which helped me relax alot. When I did Fluttershy I felt the wings, almost a hot, but calming sensation from my shoulder blades. Its not harmful, and it won't harm you in any way whatsoever. I suggest to everypony to lay down in your bed, head on the pillow, and a blanket covering your eyes. It felt more amazing than the last time, so go for it! (Amazing, my writing and descriptive skills have already improved from it! ^^)