-- Cum kisses: Check ahead of time! Following the facial, some guys will be happy to have a filthy kiss in which they get to taste their own cum. Other guys... Less so.
-- Swallow or spit: Honestly, either are going to be amazing. If you don't want to swallow, pushing out with your tongue any cum that's got into your mouth is just going to be filthy in the best possible way. But ultimately, you are going to be swallowing at least a small amount of cum following a facial. It's unavoidable. So be prepared to grin and bear it if you don't like the taste.
POSITION
There are various positions you can adopt for the guy to cum on your face. Each has plusses and minuses, and while some of the positions are obvious, there's some choices you may not have considered.
-- Recipient kneels/he stands: This is obviously the classic porn way to receive a facial cumshot and indeed, if you've been sucking cock/mouth or throat fucking, then it's a position you might already be in. The benefits are that the guy is above you, giving him optimum scope for aim and sperm coverage. Another benefit is that the erotic effect is magnified after the cumshot because of gravity, when the cum drips down onto your chest (e.g. onto your tits in the case of a woman--the only thing better than a facial cumshot is covering the face AND the body in cum). Kneeling in front of him is also nicely submissive, if that's part of your sex life. The downside is that it can be hard on the knees (and you want to be comfortable during this, right?). Be sure to angle your head correctly. Really, you need to be looking up at the guy's head, and that can be slightly uncomfortable for the neck. If you're gazing ahead at his cock and balls then the cum might fly over your head, if he's a spurter, or end up going mostly in your hair. I mean, the guy might love this. But it ain't gonna be a facial cumshot.
-- Recipient lies back on the bed/he kneels astride the recipient's chest: This is another submissive position, and as such, one of my favourites. It also allows good access to the tits for a nice tit fuck, if that's something either of you enjoy. There's ample scope for eye contact as you gaze up at him. He will shoot his cum up your face in stripes, too, which if he's a spurter makes for a good visual effect. Downsides: You might get cum in your nose. Breathe OUT as he ejaculates...
-- He lies on the bed/the recipient puts their head on his stomach: This is a nice relaxed position. He lies back, his cock pointing to the ceiling. The recipient lies on his stomach, their head facing his cock. The recipient can stroke his cock as required, and fondle his balls while he strokes himself, or possibly reach under to his perineum and asshole. As he cums, the guy angles his cock upwards to spray the recipient's face (and sometimes, with a big spurter like me, both the guy AND his partner end up getting cum on their face!). The downside is obviously that he can't see the facial as it happens, although you can obviously show him the results. But this is an ideal position if the guy is pooped and tired after all that fucking and just wants to shoot his load in an erotic way.
-- The recipient sits up in bed, back against the headboard or wall/he stands on the bed above them: This is another of my favourite positions. It's not quite the same as the kneeling position mentioned earlier because the guy will be higher up. As such, the possibilities for the recipient to suck cock/lick his balls is more difficult because the guy will have to bend his knees to provide access. But on the other hand, the higher position allows the cum to fly through the air more, creating a more erotic view (ideal if you're capturing it on your phone!). The cum also splatters on the recipient's face in a more erotic way because it's coming from higher up, making for a much messier, filthier result.
--The recipient lies on their side in bed, with their head on a pillow/he kneels with his cock close to their mouth: This is a great position if you both like the look of a good facial cumshot, because if the guy spurts he will create stripes of cum across the cheek of the recipient. Alternatively, the guy can mostly aim for the mouth and shoot his cum straight inside, which can be equally hot. If you're submissive and the guy is dominant, he can also hold your head against the pillow as he ejaculates. The downside is, obviously, that you're going to get cum on the linen. But we take that in our stride, right?
-- Sitting: The recipient can sit back in, say, an armchair or office chair, while the guy stands and shoots cum over them. This is a nice way to cover the entire recipient in cum, if you're a spurter, as well as just their face (e.g. getting cum on the woman's tits, too). Downside: He's going to get cum on the furnishings... Alternatively, the guy can sit back in an armchair/office chair while the recipient kneels in front of him. Obviously, this is a classic way to give a blowjob, but the guy will have to angle his cock down to ensure the cum shoots onto the recipient's face. As such, it can make aiming difficult, with the potential for cum to fly over the head of the recipient, or the cum might just fly up and land on the guy. If the guy explicitly states he wants to cover the face in cum during the facial, then one of the other positions mentioned here is a safer bet.