@Priory Soul said
"The Law of Thelema dictates, if a lover of youth finds his true will entwines him romantically with a child, and the kid loves him too, for them to deny the joy of their relationship would be a sin."
Sure, the Word of Restriction is Sin. But the sin lies in anything that restricts our True Will. So you would have to first know what your True Will is and then, and only then, you would be in a position to know whether your actions are in conformity with it and what is right and wrong.
I say the above, having just spent two weeks with a friend of mine. She's 46, beautiful and screwed up from a history of sexual abuse from her stepfather from her early teens. She has problems with her sexuality, doesn't trust men, and feels anger toward men. But this is only the surface. The real problem lies in how he derailed her life, her sense of inner potential. Her real issue is anger toward herself, which is at the root of her lifelong depression and inability to believe in herself.