Things have moved along pretty quick for all three. Skyler's comment is he likes Randy and is happy with where ever life takes them, as long as there's some connection.
As far as your question, I'm not entirely sure. My husband started out as a Scruff hook-up. For me it was a one and done thing. For him, he wanted a repeat and I gave in even though I considered blocking the persistent horn dog. I guess at some point it went from FWB to me imprinting, but I couldn't really tell you or him for that matter when it happened.