They weren't sensitive in the way a normal phallus would be, but they did quiver when Lobco touched them. The Hollow Knight felt its head tilt back, outwith its own volition. Bodies were such odd things, when paired with minds...

... it didn't have the time to think of something like that. Not when she curled her hand around the tentacle, and held it so tenderly. If the Hollow Knight could have let out a breath, it would have. Instead, its head tilted back a little more, and its large horns gently tapped against the bath in a little thunk.