Oh, I didn't. In fact, this conversation has been going on for a very long time now, ever since we found out about the Dio Del Sesso. But Hunter never wanted Sterling to become the next Dio Del Sesso once Sterling turned him down. After all, Sterling made it very clear he wouldn't let Hunter near any of the women. So, why would Hunter help him seduce everyone if he can't reap the benefits (because the plan was always that Hunter would fuck everyone)? Hunter knew he wouldn't be able to win Sterling over, because even in the early chapters he is dismissive and arrogant towards Sterling. That's why I said he saw a cuck-in-waiting in Sterling, because Hunter considers himself the alpha while Sterling is far beneath him.
And again, the dildo you seem so focussed on is so Hunter could go "see? It was all Sterling's plan. After all, he gave you a dildo molded after his own penis! What kind of pervert does that?".