So--they agreed they were lovers....
and in true romance novel style you memorialized their liasion
"They embraced long after the last waves of their release had moved through them, less and less intense, until everything was very still, but not in a state of tension, just the opposite. Their bodies felt like melted butter, still coming together like a living statue created by the hand of a skillful sculptor."
Rusty is setting up Matty to eventually be fully tested and to be asked to fulfill Rusty kinky desires. I do not think Matty can say no.