Idea for a final sex scene I'd love to see is this, during a FMF threesome creampie:
Have the guy cum inside her fully penetrated, probably doggy position. Then as she pulls away from him and stands up she uses her hand to quickly clasp preventing any cum leakage, then the girls swap so he can slide back into the other girl while he's still hard enough. The other girl positions herself over the other girl so they're both positioned facing away from the camera, the girl on top positions herself before removing her hand away from her pussy - allowing his cum to pour out / dribble down directly onto the middle of the other girls ass cheeks so his cum slides down onto the top of his dick as it slides in and out of the girls pussy below, so effectively giving them both an internal creampie.
Meanwhile the girl underneath has had her hand positioned under her pussy and his dick, trying to catch any cum as he fucks her. Then moments later she pulls away from him, both girls then stand up in front of the camera, the cum in the girls hand is licked off (or poured) into the other girls mouth, before they then begin slowly passionately kissing each other as they show their tongues swapping his cum between their mouths like its the most delicious thing they've ever tasted - while also trying to ensure no cum drips off their chins... additionally both girls finger their pussies feeling out for his cum inside them - taking those hands to their mouths to lick his cum off their fingers. They then swallow it all before facing the camera confirming they both swallowed his delicious cum. Continue kissing a few seconds more, each licking up any lost spots of cum they notice on the other girls face/neck/chest.
Then as they slowly walk away from the camera in a really naughty swagger try walk in a way as to show off to the camera any possible skin-glistening cum leakage on the inside of their thighs from their time of snowball kissing for the camera.
But please, please, do not use fake cum. Try have a male pornstar who hasn't came in a while or is a known heavy cummer, I realise there's always a chance he might not cum much though.