Dear Japanese people ...
Is somebody getting off on this? I don't understand.
Are you new here, where by here I mean the Internet?
Considering that they're both wearing outfits associated with Japanese fetishes (sefuku and mizugi), yeah. Someone's getting off on this.
It would be easier to fap to it if it were longer than 23 seconds.
(Okay okay, I'm bragging...)
The little back and forth their legs make after impact really sells the entire exercise.
Thank you, sir. I needed that.
For reference, this is the work of Cocoa Soft. Their mud page also includes other classic works like "Mud Shower" and "Cow Shit".