ohhhh okay. then it would definitely be a lot of growth stuff i think. like breast/testicle expansion, urethra fucking is a given since sounding is doable IRL but you can't get full penetration with another person's dick or fist and i think that would be really hot. and obviously horsecock on people would be a turn on.

also probably object vore, it's super sexy to watch people who can deepthroat insane stuff and i feel like it would be even hotter if you could watch someone stuff their gullet with like 3 double ended dildos.