Just some random thought here, Max could tell her that they need to have sex more often and also that he read about a position that is good for the woman to remain in and also say he wants to make it more exciting with bondage and sensory deprivation, and he has researched a diet and hard exercise plan and some herbs to help fertility for both of them. She reluctantly agrees since what he found out actually has some sense to it, and she has noticed he is getting a bit distant in the bedroom and does not want to lose him, so she pretends she is more into it than she is.
The position is to cuff her to a special love chair, where her head is resting tilted back, her back held arched and her pussy and ass up in the air, her legs cuffed to her sides and her arms too, with the blind fold and ear plugs. He starts out with getting her well and truly relaxed before this though with massages and special oils that have medicinal properties to increase female fertility, and he gives her oral sex to make her cum until her pussy is very ready to be fucked and she begs for it. He gets excited by the new position and his plan so he manages to cum for her three times in one night, the first in her pussy, the second in her ass (he had shown her research that suggests the hormones in male cum will help fertility and the best way to absorb it was if it was delivered anally) and finally he fucks her throat. Then he fucks her that way for a week, she really gets more loving and really interested in sex with him during this, even taking time off to allow for longer sessions of this.
Then after the week he invites several of his friends, and after he cums in her pussy and ass and starts to fuck her throat they come in and start to fuck her pussy, she immediately knows it is not his cock, because it feels different an because he is in her throat, and she tries to protest and break free, but ends up having some of her most intense orgasms as they take turns fucking her through the night and well into the way, making her not show up at work on monday for some really important meetings. Ending up loving this even more than he does, and she also ends up pregnant, and they are not sure with whom.
((just some ideas, do your own thing though))