I was responsible for coining the NSFW tag for Pizza Tower on Twitter (#PenisTower), two years ago.

For some context:

The practise of using a separate tag for NSFW art on sites like Twitter and Tumblr so that minors or people that just don't like porn don't come across it in some fandoms was popularised by Toby Fox back when Undertale was blowing up in popularity.

At the time I drew that "Unicorno Gelato" thing, there was no PT lewds when I typed in the hashtag, so when I posted it on twt, I used it since it would be scandalous if I used the normal PT-related hashtags.

When I went back to the PenisTower tag a while later, I was surprised to see other NSFW artists use it for their Pizza Tower porn art.

I don't and will never own it, of course. Because copyrighting a tag is stupid.