My boyfriend proposed to me, if I would lend myself to take away the desire of his young step-nephew

I'll tell you, I'm a 27-year-old girl, I live with my boyfriend in his apartment My boyfriend has a step-nephew, who takes care of him and sees him as if he were his step-brother very often brings him to the apartment, to eat, to watch movies or to play video games His step-nephew is young, who is usually very quiet A few months ago my boyfriend told me that he is worried that his step-nephew would then lock himself up and watch porn for hours That doesn't do well, to be watching a lot of porn, so I told him that also because of age it was normal to bring a lot of sexual desire And I asked him if he had a girlfriend, or a girl with whom he could take out that desire My boyfriend told me that he didn't know anyone And it is that his step-nephew, as I mentioned, is usually quite quiet, that is, he is not shy as such, nor embarrassed, but rather he is as reserved Then, my boyfriend told me that if he should take away the desire with a woman So I told him, yes