I think that in the universe where this VN is located, sucking cocks and other genitals, swallowing semen and other bodily fluids, etc, it's like kissing a cheek, a handshake, you know, the MC character goes to his aunt's house, who is a mega milf, undresses her, eats her pussy, gets dressed and they leave as if nothing had happened, He is with his "sister", she takes off his clothes, eats his cock, swallow his semen, and then they just talk, the same thing happens with the milf with whom he is going to jog in the forest.
Graphically this visual novel is something else, the designs, the environment, the lighting, the details, the angle of the cameras, everything is great, but the plot level is not so good, and everything lacks common sense.