If you either (1) wait till da "current" hugger has finished embracing your "
target" individual, or (2) politely/humbly ask da snuggling couple if you may "have a turn" wif da desired-by-you person, then it's not really "armed robbery", since both members of da couple are voluntarily allowing you "clasping 'n' caressing" privileges.
Extra points if you (1) offer to engage in a group-hug wif both of them instead of just giving one of them a "separate" hug, so
dat neither person even has to actually let
go of da other after all, or (2) be sure to give da OTHER member of da couple a hug, too (maybe even before you embrace your "
target" person, so
dat said other person knows right off
dat he is gonna "get some lovin'" from you, also, and thus he will not hafta worry
dat he's gonna feel left out), showing him dat you value his feelings, too, and are grateful to him for letting you have your desired snuggle-wuggle wif his romantic companion.