Neighbor Bathing is when characters have a Bath Bonding scene but rather than sharing the same bathtub or taking turns to sit in the tub during a Furo session they simply have separate Bathtubs next to each other to bathe in and get to themselves. Though the situation is very rare since most places wouldn't have two bathtubs next to each other or even in the same room, these are typically common at unique Public Bathing facilities. This is a bit more common when it comes to Barrel bathing since an average barrel can barely fit two bathers and it would be more simple if they just bathed in seperate ones if the resources are available.
Yuri and Kei take Bubble Baths in two bathtubs next to each other that they found in an abandoned mine as part of a break they decided to have to wash off their Filth. While in these baths, they face the opposite directions of each other. While Kei relaxes and Yuri was focusing on Shampooing her hair, the two girls converse with each other though they had to stop bathing once Carson D. Carson fell through a vent while Peeping on them and lands in Yuri's Bathtub clothed and gets Bath Kicked into Kei's tub. Later on in the movies ending credits, the two girls are seen neighbor bathing again but in Wine Glasses on opposite sides of the screen.
Though it was Off Screen, it is implied through a brief shot of both of the bathtubs in Najica Hiiragi's bathroom to be full at the same time and that both her and Lila are seen outside in Bathrobes implies that they both took their baths in their respective bathtubs at the same time.
At a spa in Ba Sing Se, Katara and Toph Bei Fong are seen having Mud Baths in two seperate tubs next to each other with both of them facing the same direction. The two aren't seen doing much talking but when Toph freaks out one of the bath attendants with her earth powers to make her face mask make funny movements, they both laugh.