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The only way to know if she's into you is to get some oil, powder or lotion and then tell her to take off her blouse/shirt. When she complies, go on with the back massage and randomly sneak your hands at her sides where the boobies are as she lies face down on the couch. Next, tell her to take off her pants so you can massage her legs as well. When you hear her moan as you touch her thighs near her pussy area, escalate your touches, pushing and pulling.
Next, tell her to lay down again and go on massaging the back of her legs and then massage her ass like it's the normal thing to do. Position yourself on top of her so you're rubbing your dick at her ass when you work at the side of her boobies. When you hear her moan some more, escalate some more. When you see her ear lobes turn red, f-close.
This way, you will know if she's into you.

Hellhound with his porn addictions.
Regarding whether she's into you- it's hard to determine that from reading a few independent clauses. If it was my guess, and if I am picturing the situation correctly, I think she is.
Regarding the moral issue- nobody can tell determined your morals for you. If it was I, I wouldn't do it. I've cheated and I've been cheated on before. It goes down to two things for me: 1. I'm not so thirsty to drink someone's else juice. 2. It's not hard to find single girls.
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A morning of awkwardness is far better than a night of loneliness.
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