ZENRA There exists fans of this type of activity outside of Japan?
100%!!! It is very popular in euro scenes (in 2D world and VR world). And many US VR studios incorporate this regularly. Alex Nash / Mack for SLRO, RealJam/Porncorn, NaughtyAmerica, etc. I find it particularly hot in multigirl scenes since it gives a role to the second performer instead of just staying idle on the side or background. Makes for great face-closeness, eye contact, and promotes ASMR too since they are so close to the ears of the viewer. VR studios who don’t incorporate this are missing some great opportunities for more intimacy in any scene with more than one woman, IMO.