It's on the tip of my tongue, but it's not coming any further. And I may be fooling myself about the tip-of-the-tongue thing anyway. But I'm looking for a word that means, like, smushing things together so they combine, like taking two balls of playdough and making one bigger ball out of it. For context... They’d gasp into each other’s mouths, rut against each other as if trying to join their bodies not just sexually but in some sort of _______ ______. I want to say "miasmic bond", but that's really not what "miasmic" means. But that rhythm of words, if that makes sense. Anybody able to help out?