When Leo gets worked up he gets hot. Really hot.
There used to be fire extinguishers in every room on the ship but now there are only a few left.
So every time Leo and Nico have an argument or a particularly aggressive make out session, Nico can be found running in and out of rooms looking for something to put his shirt out.
There have been instances where the couple have interrupted dinner by running into the kitchen, all panicked and flustered, only to grab a bottle of water, empty it over a slightly singed Nico and carry on yelling.
People have also walked in on the two blushing furiously, trying to subtly pat out each others clothing.
It’s not uncommon to see smoke creeping out from under Leo’s bedroom door. By now everybody knows better than to interrupt whatever might be happening behind it.