I like the detail that though Gigi is affectionate with the other three, it only shows her matching the light glimmer effect of affection when arguing with Cecilia.
^ If you mean how the sensation would map to the Tsukiyomi user's body: either the technology is advanced enough to give you "phantom limbs" to feel pleasure (or pain) in, or it'd probably go to the nearest analogue.
For ears, that'd be ears (duh), already an erogenous zone for some, but for a tail ... well, humans still have a coccyx (tailbone), and it's located very intimately.