You think she actually likes WAM or is she just indulging her BF? (AKA the male hand doing the pieing...)
I'm cynical so I'm betting the latter but hell, you never know. I suspect she likes the attention regardless.
As always, you're an insightful WAM fan/human.
I tend to agree, but i think you nailed it with the "attention" part - she isn't hating what she's doing, but i don't think it's likely her and her alone slash self-motivated.
She could also honestly enjoy it as purely fun, silly thing while not being sexually aroused by it. It's clear she knows it turns some folks on, most importantly her husband/fiance. And it's possible that idea in and of itself is a turn-on for her. A good number of women get turned on by doing things they know are sexual triggers for their partners, (GGG, or good, game and giving in Dan Savage parlance) and this really can work to a wamner's advantage, particularly if the wammer in question is willing to reciprocate, but even sometimes when he or she isn't or can't (I.e. You can't indulge the fetish of someone who doesn't have a fetish.)
Love you, too
