Well. The vibrator was made to cure women psychical and physical troubles because of sexual frustrations so a place where you can get off will be packed with horny chicks.
Reality stepped in for a second there. Ditzy girl gets assaulted and calls the police. In his defense he did put her body through a lot of stretches. Some of those positions couldn't have lasted more than a few thrusts.
*looks at the last panel* Hehehe... only girls, nice! Wait... is the last person in line on the right side on the border of the panel a cop? I mean, it looks like the person is wearing a police hat....
Another time, place and artist: MC's life goes down the sewer (literally and figuratively) by the close.
Here and now: "Mukai-kun, ... you Lucky Bastard (GRR)!"
P.S.: I will defer from inquiring from any real-life chiropractors, masseurs, etc., whether this is actually a genuine situation that they encounter in their practice from time to time.