i dont even wanna know what a "flesh potal" is but im excited to find out
It's when someone's mouth, butt, vagina, hole, is linked by a magic portal to a toy or something similar.
In this case, one of the character's has a cock sleeve that leads to the other character's ass. So, he can fuck the sleeve and the other character can feel it.
It is something I see in hentai a lot but doesn't seem to have an agreed upon name that I know of? So I went with "flesh portal"... Guess it isn't as clear as I thought it was? So I'm open for suggestions on what to call it.