A seed planted?

On Thursday, my best friend said, "When it comes to stuff about God, you're pretty knowledgeable, right?" In my own humble way (lol) I said, "It depends on what you're asking." So he asked me if porn was a sin! I told him that yes, I believe it is. He asked me if looking at porn would send him to Hell. I told him that simply looking at porn would not be a sin, but the thoughts that it MUST provoke in a person certainly would be sinful. Looking at porn was the means to tempt him to sin further. Then he asked me if self-gratification were a sin. I told him that is why I said porn leads to further sin. Self-gratification bypasses the plan God has for us to use our sexuality to procreate. Also, that by looking at porn, he is helping those who are cheapening their own self-esteems by participating in the medium. I told him that he shouldn't be concerned if it were sending him to Hell, but rather that any sin is hurtful to God. I also told him that God is a loving and merciful Father, but one would have to pay the consequences for his sins. Then I told him the good news--that as a Catholic I believe that all sins (save one) can be forgiven through confession and the performance of penance. I am hoping that I planted a seed. He professes that he believes in a Creator, but follows no religion. Several times now, he has opened conversations with me about my beliefs. I wish I were stronger in my apologetics so I can help him more. I think the best thing I can do for now is to continue to go to mass as often as I can, keep saying the rosary, and pray for his conversion. And hope that God keeps His Spirit burning in my friend's heart, even if at times it is only a flicker.