Hey, so, there's no "true end" yet since the story is not over.
If you're talking about Tyler's"true path" on chapter IV, it's:
(SPOILER ALERT)
Escape and beg Tyler
Get up and follow
Put on Latex
Start Posing (pick only the Pink poses)
Yes, desperately want
How long
Stop sucking and look up
Tyler approaches
Restrain
Yes (but he won't hold it against you if you leave the tub, I know watersports is not for everyone)