It's So Warm is a quote uttered by Lillie in a scene from the Pokémon Sun & Moon anime. Shortly after the episode's English premiere, the quote went viral and is often associated with dirty and NSFW videos and remixes.

Origin

The quote originates from the English dub of the sixth episode of the anime. It occurs very late in the show where Lillie is shown cuddling the egg of a Pokémon in her arms, commenting that "it's so warm". A clip of this scene uploaded by user PearlshippingTV currently sits at over 6,000 views.

The same user was also responsible for this meme's creation. Before this clip was posted, a video was created entitled "Ash & Lillie Decide To Practice "Touching!" (NSFW)" and posted on April 22, 2017. It features a clip from the same episode edited to make it sound like Ash and Lillie are engaging in some adultery (with the "It's so warm" quote included). This video sits at over 65,000 views.

Spread

Aside from PearlshippingTV's many other videos surrounding the quote, it quickly spread not just on YouTube, but on other sites such as Twitter and Facebook and has been referenced quite a few times within the fandom (fanfiction have picked up on it for instance).

As with the example listed above, many of these videos/associations tend to be dirty and explicit (or at the very least imply sexual situations) and are considered NSFW.