At 19 why not just move her in?
No, you shouldn't. Your neighbor's teen is to young to begin a relationship with you. I say relationship, because I doubt it is truly love that you'd be making, more like just responding to your sexual urges.
I recommend you continue your search for, "a sweet female with whom i chat talk freely" with. You, your wife, your neighbors, and their daughter will be better off.
If she is legally old enough to have consentual sex, and she is wanting it, go ahead. otherwise keep away and counsel her not to think of sex not only with u, even with enybody else
I had gay encounters before marriage, and not after marriage, but of late I do fantasise about that