In regards to the Vita, the Vita is well known for it's niche "moe" and lolicon Japanese games. Hence why the it's a dancing loli. In regards to the switch it's a play on the switch being a successor to the vita.
Wonder if we'll see Switch replace vita as the handheld of choice for VN ports. Looks like 720p is still the de facto standard for these games, which should make porting a much easier process...