Well I'm sorry you don't like the harem route. Or the incest (although if I am not mistaken you need to download a patch to even make it incest...so I'm a bit confused by that), but the whole point of this game...the entire premise of the core story IS an incest harem story...its about reconnecting with long lost family and finding love among them...so if you want a solo, non incest game there are lots of them.on f95 as well.
I tried normal guy route to see if dev forseen this happens and have another routes, but no. Its just experiment. I didn't tell that i doesn't like current things.
P.S. Nightmare about Melissa happens even if you don't follow revenge to Tanja route. Just noticed.
Routes explanation:
1) Sandra route. A core of this game, most other routes depends on it.
2) Lucy route. Not sure, will update after knowing. All i know that you should have her, if you want to have Melissa. For Tanja route, you should choose to avenge Lucy;
3) Alice route. Probably, depends on Sandra and Lucy routes.
4) Rebecca route. Some content require Sandra, but, probably, doesn't need it.
5) Mary route. Easy one.
6) Maddie route. Pretty much, easy way to get it.
7) Yvonne route. Requires Sandra route, overwise you won't get it.
8) Arianna route. Need Sandra and Yvonne routes.
9) Melissa route. Need Lucy route.
10) Fiona route. Can do without Mary route.
11) Sun route. Easiest route in this game, which doesn't require any other routes.
12) Tanja route. Need some progress in Lucy route.
Extra:
1) Elaine route: no idea, yet.
2) Ida route: probably, require Maddie route.
3) Dianna route: need Fiona route.