After Lucan and Maris officially decided that there were couple, it's meant, a lot of touching and kissing.
Lucan wasn't going to hold back anymore, and would absolutely enjoy his beautiful lover, the most beautiful woman in the world.
However, beside kissing, they didn't did anything. Today, Lucan had more thing planned, but before that, he and Maris were kissing, tongue wrestling. It made Maris hot and she desparately wanted to touch herself. However, not now, she will do it at night alone. It would be embarrassing to do it in front of Lucan.
As for mastrubation is sin, she shouldn't do it and all? Well, Aurelia told her that she didn't wanted to human's population increases dramatically, she made rules about sex and all, and also that, two children are enough. Of course, over course of history, thing changed, but one thing Maris understand that what she was doing isn't sin and she should enjoy herself.