I got this from some other site
"It all depends on how many times Rikku chokes and throats.
"Chokes" refers to you holding her head down until things get black and she pulls away.
"Throats" refers to fast throat fucking. This is counted when saliva actually flies from her mouth when she gets all the way down.
If you get all of the voice messages from Choking (the last one being "Yes... More!"), you'll have an ending where the cumshot is in her mouth. It really gets everywhere anyways.
If you get all of the voice messages from Throats (the last one being "Yes! Tear my throat apart!"), not only will two men join in, but it ends in a big facial.
If you don't get to the ending of either before you cum, it's a simple facial.
If you get both, the two men join in on the facial, but only after you cum in her mouth."