Sure it's kind of gross, but, unlike the spear incident, it's within the realm of physical possibility. So unless the actual writing was horrific, I think it comes under the heading of the Slash-Sporking Guide on the Wiki (even though it's het, but the point still applies):

"Slash, however, and what makes it bad, is rather more of a heated subject. The usual place we run into trouble with this is on higher rated, PWP and kinkfic. Because of this, the Prime Directive of Sporking Bad Slash, for me at least, is 'Your Kink Is Not My Kink'. Our job is not to judge other people's taste in porn. People are allowed to like what they like, and people are entitled to their opinion. If they think that Character A urinating into Character B's mouth is a turn-on, that's entirely their business. And if they've managed to justify Character A and Character B wanting to engage in such an activity in decent-enough prose, then you should leave them to it. Yes, even if in your personal canon, Character A and Character B would rather die a thousand deaths than engage in what is charmingly referred to as "watersports". Unless it's specifically said in canon that Character A and Character B don't like watersports, then there is always the chance it can be justified with some clever writing and a twisty set of speculations on their thoughts."

How do you even come up with something like that?