You stripped your clothes off before you got across the room to the bed and eagerly jumped on to it. Amber had ducked down and occupied Molly's pussy with her tongue but she was also currently on all fours. You crawled up behind her and placed your rod against her folds from behind, only for her to suddenly wrench herself away from you.
You were wondering if you had misinterpreted things when she said: "If my ass is worthy of emulation then that's where I want it."
You smiled. "I wish your ass was clean and lubricated."
She shuddered a bit at the sensation and then went back to eating out a very responsive Molly. You smiled and placed the tip of your cock against her ass and started sliding in. It immediately became apparent that the skill you had given yourself earlier applied to this situation as well as soon you had Amber moaning into Molly.
After a few more minutes her back arched away from Molly and she fell to the side, gasping and thrashing like a landed fish. A clearly awed Molly watched her and then looked at you. She rolled over and placed her own ass in the air, "Do that to me!" she said.
So you did, and by the time you'd reduced her to a barely cognizant pile of orgasm Amber had recovered enough that she was ready for another round. You had just given Amber her second brain melting climax when you heard a chuckle from the doorway and someone said "You look like you're having fun."