My Girlfriend's Mom Is Much Finer than Her, So I Can't Hold Back!!

The protagonist Yoshiki accepted a classmate's love confession not because she was his type, - but because he simply wanted a girlfriend. - Even when they have sex, he finds himself unable to get excited, and he's forced to - imagine his favorite porn situations in order to force himself to cum. - But everything changes one day, when he meets her mom... - His mind is fried by her hotness, and he gets madly horny...