The Evening Before by TheSamMoose (Archive Link)
This story here by TheSamMoose involves Andrea, Markus and Jeremy again, but this is more of the introduction to Jeremy and how Andrea and Markus got him into their extreme skinsuit fantasies. This one here especially plays around with the skinsuits that transform you into some kind of sex toy.
Especially the end and how it continues in The Morning after was spectacular to read.