When should the crescendo end? (Patreon)

I'm working on final audio for "Qetesh Quick", which you may recall from the preview here. I want to have a crescendo during the sexy time at the end, but I can't figure out the best place for it to end.

You can check out the video here, it has the 3 different options captioned. I've already added the tracks from the voice actress(the fantastic PixieWillow), so please enjoy those ;)

Note: audio might be a bit loud, I haven't finished balancing it yet

https://drive.google.com/open?id=1jk23ENu_EcXejs224nKLRQ1llW7s2Tua

So, when should the crescendo end?