if ur a giant horrific monster, my dms are open

Okay so anyway I know nothing about biology BUT I love worldbuilding

I imagine that when tieflings weigh their tails down there's two different types of weights.

The first ones are practical ones. Not every tiefling can just give into their heat. They got jobs to do! Bills to pay! So these ones are more simple and are purely for purpose of weighing down tails. Most of the time it's like, a heavy sleeve and the inside is often filled with heavy beads or rice or pebbles or something ((kind of like a weighted blanket where its inside)) and in the case of stronger tiefs ((like zev 🤭)) they often have heavy metal bracers or cuffs around them as well just to weigh em down a bit more. Some wear em only at the ends of their tails, and some wear em up all the way.

The second one are the decorative ones. Sometimes they start off with the weighted sleeve, like stated above, as a base and then they'll wrap decorations around it. Or sometimes, the decorations are heavy enough that they'll just use those. (( In my brain zev always wears that little sleeve tho, he’s an old man who values comfort over style lol))

And if course the decorations and any meanings vary from tief to tief. Some tiefs wear basic metal charms with some chains and stuff to look cute, others are dramatic as hell and will wrap gold and jewels over their tail.

I dont think there'd really be any specific way to signify being in a relationship or not. A color system wouldn't work since tieflings come in so many colors that they could just be matching their partner. And I love the chains idea but chains are so hot i think everyone deserves them. Maybe they wear a padlock on their tail to symbolize they're taken??

I LOVE the thought of there being a symbol for free use tieflings in heat though. In my mind it would be any sort of bells. Some are more subtle and wear smaller ones on the ends of their tails, others are loud and proud and desperate and will wear large ones and it's a symbol for any other tiefling around to come use em.