I see in the next pic the first one didn't stick at all so I bet it was lemon meringue. Always heard it's not optimal for face smashing for that reason, so I've never tried it myself.
I think this set might be the most genuinely awful mess I've ever seen a person get subjected to, which I say as a compliment. I hope you appreciate how insanely fortunate you are to have a partner who's so willing to help you explore your kinks. It's equal parts heartwarming and disgusting.