Yes, the MC is the only guy who gets to have sex with all the girls. As for the wallpapers, they're just illustrative. And I'm just like you, I hate NTR, so you'll never see anything like that in my games (like other guys sleeping with the girls besides the MC).
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I know your games don't have that kind of content, that's why I've played all of your games and i love all your games. I would refer to the wallpapers and images that you upload to your patreon since it's the site I plan to support you.(I just want to know if there is at least one wallpaper like that, since I plan to see them all and I don't want to get a bad surprise). It's just that I don't want to subscribe to the patreon and see a wallpaper,scene or a image pack of a girl I like of MNSC with another guy or being treated like a whore or something like that, etc.