The following is pure fantasy, but not outside the realms of fevered reality.
The party has been underway for some while. It was "invite only" as Fabienne and Fernanda wanted to be sure that there was a level of maturity in their audience for the evening. Men who were known to respond well and can both afford and appreciate the special type of entertainment that the two girls were becoming known for: a level of eroticism that rises above a basic display of tits and ass together with boyish and/or rough fumbling.
One lucky attendee was chosen and invited to share the girls together in the bedroom. When the door closed the man stood there rather stupidly - all the promise is there but what was he supposed to do, how does this start? He needn't have worried. Fabienne pressed her partially dressed body up against him, lifted her chin and brought his mouth down to her lips gently with her hands, exploring as she breathed out fragrantly against his face, a delicate and warm welcome. Fernanda took the cue and pressed her ample breasts into his back, then ran her hands down and across to his flies, resting them lightly against his penis through the fabric, waiting for Fabienne's tongue to do its work and together trigger the inevitable swelling.
Time to remove clothes, the two girls working together to reveal both their and his naked bodies, before resuming with deep kisses from each girl in turn as the other crouched down, cupped his balls and began to lick the length of his stiffening cock. This would continue for several minutes, whereupon the man, concerned that he might ejaculate too early, asked the girls what he might do for them. Fabienne again bent his head down and whispered in his ear that she wanted her ass rimmed. Following a direct and commanding look she mounted the bed on all fours and pushed her wide bottom out ready to receive his tongue. Fernanda looked on, inspired by Fabienne's gasps of pleasure, which increased in volume as he lowered his attention to Fabienne's prominent labia, gently sucking them in an out of his mouth, running his tongue over their prominence and drinking the juices that had begun to flow. Ever considerate of her friend, Fabienne suggested that Fernanda would like the same caress. They swapped positions. However, Fernanda has a larger, more luxurious bottom than Fabienne. Considering the challenge presented, Fabienne leant over her friend's ass and held both cheeks apart to offer up Fernanda's ass hole for her turn at the man's skilful tongue. As his tongue-tip circled Fernanda's little brownie/pink star, Fabienne was able to spare a hand to caress and open Fernanda's puffy pussy lips, revealing her sticky juices readying for pleasure to come.
Time stood still for Fernanda, absorbed in the delight of her ass and pussy pleasure. He had begun to gently take over from Fabienne with his hand, lightly brushing over Fernanda's clitoris towards a rhythm which would soon trigger her first orgasm. Fabienne meanwhile busied herself at the side, then asking if she might take over.