My Girlfriend's Mom is Much Finer than Her, So I Can't Hold Back!! Final by Gekkan Toshiue Milk Tank eng ver - Adult Sex Game

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...