After some time in that bathtub, Minos and Abby had just exchanged a few kisses and 'pure caresses' without a deeper intimacy.
Minos' young friend was gradually opening up to him. However, she still had a lot to improve until something more significant happened. Abby had a very different mentality among all the women with whom he had interacted. Because of that, she valued this kind of relationship much more than the others.
However, as a young woman in her early adult life, Abby could not entirely ignore Minos' advances. Her body made her feel more and more willing to interact with him, and she gradually felt more at ease mentally to enter the 'game.'
Allied to this, the fact that Minos was a persistent 'player' also contributed a lot to the gradual behavioral change that this young woman was exhibiting.