Am I getting myself into a bad situation here?

Not good at all. If it feels bad that means you shouldnt be doing it & it needs to stop. He can go to jail just for kissing you. This man has no respect for you because if he did he would honor your mothers wishes by staying away from you. He knew that your mother didnt like what was going on between you because thats what they talked about & im sure she told him to back off but he didnt. He proceeded to encourage you to meet him in secret then to kiss you which he knows is a major no-no on every level. If he thinks this is a good thing why doesnt he go to your mom or grandmom & tell them that he loves you & wants to be with you or something. No he just wants to take your virginity away & sneak around having sex with you until he gets tired or you get pregnant. Stop this now before it goes too far. When you get to the cabin tell him to stay away from you or you will tell your mom. Dont let this old dirty a-ss pedophile of a man ruin your life. If he would do this to you he would do it to any 15 year old maybe even his own daughter.