This is basically just helping me find my own fetishes faster, and I'm not even sure there's enough examples to make it worth tagging.
The basic scenario is two or more passive partners lined up for one active partner, with the implication that either the active partner has their choice, or will be doing all of them in some order.
post #397261 and post #356239 provide fine examples of this. Bondage is not explicitly necessary, but I expect it features in most.
It possibly falls under other tags, but line_up is for height comparisons or police lineups regardless of rating, and queue is people waiting in line, either innocently or several active partners waiting to service a passive partner a la gangbang.
There's also a subset of this type that's also contained in my fetish, but could be discrete enough to not fall under the same tag. This subset consists of a like number of active and passive partners, paired off and lined up such that they can interact between pairs. post #152902, post #92690, and post #393037 are good examples. (Warning, all three are kinda cubby, but not tagged as such).
I also don't know what to actually call the tag for this fetish, since everything I can think of would also fit another, more innocent scenario.
Updated by Circeus