Personal advise please?

I baby sit my neighbors two children. They are 6 and 4 a boy and a girl. I'm 17 and will be 18 in a month. My neighbors wife ped away three years ago in a car accident, and he has been taking care of his children by himself. He's 25. There are times when he's away overnight or late in the evening so I stay the night in the third bedroom. He doesn't go out or anything, he pretty focused on his children. Last week he came home late a woke up but didn't get up to let him know i knew he was home. A short time later I went to go to the bathroom, when I could see him in front of the TV masturbating. He was hugh, and I watched until he finished. He never knew I was there, but I did enjoy watching him. Since then I keep emagining him being with me. I know this is normal (so no jokes). But Monday night I think I went over the line. Instead of going to the bedroom to sleep, I fell alseep on the sofa. I was wearing a short skirt with "no" panties. When I heard him come in a made sure he would be able to see everything. He stood there for a moment just looking. I kinda rolled to my side and pretended to wake up, but made sure he could still see me. I started talking to him about his day and stuff, but could see he was getting excited. A short time later I had it in my hands and well you get the idea. We didn't go all the way, but we did do oral to each other, but he refused to put it in me. He said I was still 17. I want him so bad, what should I do. Any advise?