I think, that this would make more sense to be in general when a cum bubble is formed, since it doesn't only happen with oral sex. There are also situations like in page 54 of #643448 | JK no Otoshikata -NTR Hen- | The Fall o… | 8,782

Its sexy but unesesery (sorry for bad english)

I think "cum bubble" would be a better name, and I would disentangle it from the nose specifically as cum can become bubbly in whichever orifice it finds itself whisked through. I've suggested create tag cum in nose +18 as an option, although I think we should have both.

I wonder if such works should be considered "all the way through". I think not, but technically it could still be applied as it comes in a way and goes out another