Oh there are options for the OP....the best one being - MOVE OUT and get out on your own one way or another. You are going down a very slippery slope and if you don't put distance between the both of you, you will regret it at some point, not to mention hurting the very person you claim to love.

If you need assistance finding and securing your own place, look for it. There are many agencies that help folks find their own places as well as monetary help. If you are disabled and can't hold down a job, apply for disability if you haven't done so already. If you are not in therapy, please consider finding a T and going. You seriously need to work on your thoughts and emotions about your step-sister.

In other words, start taking steps to be responsible for yourself. Know that just because we may feel something doesn't mean we have to act on those feelings. You choose how YOU want to act.

The reason I'm writing strongly to you is because if you decide to act on your feelings, there will be extremely difficult ramifications. You could hurt this girl in ways you can't even imagine. This could affect her whole life in a very negative way. You could find yourself in jail and labeled a sex offender for the rest of your life. If you think life is hard now, think about how that would affect your life.

Take steps to fix this problem now. You are the only one who can do this.