You know what would be interesting to see? Variations of the living underwear. Like maybe a more discrete version that has fewer tentacles but is far more intense. Alternatively, portal tech added to underwear could be interesting. You could leave the other side of the portal in various locations. And depending on where you do, it could lead to different bits of dialogue. Maybe even going as far as someone just swiping the other side for themselves wherever you left it. Causing a sort of side quest that requires you to find whoever decided to keep it. I always find gimmick clothing in fiction to be incredibly interesting. Living latex being a personal favorite of mine.
Actually, how likely would it be IF portal tech was added you could use both ends of the portal on yourself. Like if you had both male and female genitals, you could just walk around inside yourself. Could also lead to the possibility of the self impreg kink.