You always have the option to go the Love route or avoid NTR in slave route but if you like NTR you can ask her to be a prostitute where other guys fuck her and you just watch but that's totally avoidable, if you want to earn easy gold then you can do that.
You can avoid it in the slave route? Then why does entering it specifically claim that whoever on it WILL be fucked by multiple guys and you WILL be cucked. Yeah this is just a shitty NTR game. Way to leave your identity of a nice simple harem game. When you notice the games not doing well recall this moment here