Finally learned how to make poses (^^*) Aheh, they are a bit random and awkward, but oh well. They are only in game and replace the “warm self” animations, so just click on the fireplace and choose that interaction and the four poses will play instead, each lasting about 6 seconds.
The download is a zipped folder with 4 packages, so you can choose which ones to install. You can have all four at once since the “warm self” interaction has four animations, so each pose replaces a different one. If you only install, say, nr 4 then the sim will probably use the fireplace normally for a while and then pose at the end (it replaces the “stop warm self” animation).