What game are you playing? Because it isn't this one. You can't even advance Mira's quest without sleeping with Gwen. Your arbitrary not fucking Emily, but fucking every other woman in town is not "faithful".
Ehm, i don't know if you mean it or if you're just joking. But, sorry to tell you this, but you can fuck/make love with Mira without sleep/fuck Gwen.
When i start the game, i wanted Mira to be the first woman I had sex with for the incest factor.
Also because I thought the MC was a virgin, so I wanted the two of them to lose their virginity together and make love.
So as i say i play the game, till the MC's end up in Gwen cottage. Then after she use the spell on MC's dick, i say no to Gewn.
The MC's wakes up near the big tree, where the game explain to us, how to control the lust bar and give you a new power (mastrubate

). After that i start to do Mira, Lucius, then i use the anestetic in the cauldron, so Gewn go to sleep, pick up the book for lucius, give the book to lucius, so i finish control the lust quest. After i focus on Mira, till i uncover the letter and made her MC's sister. After that, she become an accolyte. Then i follow the quest, find the erotic book for Mira, continue to visit her, till the MC's and his sister Mira finally make love.
Now while I am raising my relationship with Mira, before she has to do the ritual in the church. I am raising the relationship with Emily, so that I can have the Harem threesome with Emily, Mira or Emily, Frisha. And also because if you start a relationship with Emily, before Mira finishes her ritual, you can start a love relationship with Emily and not just sexual.
The important things is: If you have NTR on, you must... Make love with Mira, Tell Emily you want a relationship with her.
Then do not fuck Syfa. If everything went like this, Mira will accept that you're in a relationship with her and her mother.
What I don't understand is when the other user says "faithful". So he will only have sex with Mira? In a game, where you can marry multiple women and have multiple wives

this doesn't make sense

I could understand if he doesn't like milfs, or if he doesn't like some women in the game in particular and therefore wants to avoid them. But why do that? Honestly, up until now I've found them all very seductive and I haven't rejected any of them yet.