my dad's friend asked..

If he could pay me 100$, to let him eat me out. This started a bit over a year ago, I was 16. I got onto an app for people 18 or older. I lied about my age, and said I was 18 so that I could have it. I wanted social media, but not Facebook. I wanted to talk to different people. Anyways, everyone who did message me, I told them that I was 16. An older man messaged me, (40's) he looked and his name sounded familiar. I then told him "I think my dad knows you." (He does. They Went to school together.) He didn't want to know who my dad was. (I later on told him who my dad was. I Told him I was 16. One of my dads other friends, treated me like a daughter too. We were close and it was nothing ever weird. So I didn't think talking to my dads other friend would be weird. He talked to me about his work, random things. He told me he has to watch random videos that are work related he said he hated watching them, that they were boring. He said he'd pay me if I watched them for him and took a quiz. Watch a few videos then take a quiz for money? Why not. He asked for my number so he could call and give me his login info, I gave him my number. I know, I should've known then it was wrong and odd. But I thought it was innocent. The login didn't work and I wasn't able to watch them. Later on he texts me "hey cupcake. How bout you make some real money." Me being the dumbass that I am, I said "I assume you mean fucking." I could've used the word "sex" I know, I was wrong. And he said "mmm well yeah lol I'm watching 3D porn wish u were older" I told him I wasn't interested in sex. He said "no sex then, have you ever squirted? How about I pick you up, give you 100 to eat you out, and take you home right after." I told him I could use the money but I didn't want to do that. He ended up backing off after trying and apologized the next morning, I forgave him. He then texted me a few months later saying he was going through contacts and wanted to message me saying he got a new number. (I blocked his old one and deleted the app.) I told him it was random and I assumed he saw my dads Facebook post about me and my family going to an event. He said no and then asked what's up, I ignored him. Haven't talked to him since. Both of my parents know, but I begged them not to say anything. I don't want to be mean and get him in trouble. I feel like an idiot. I was 16. I know better then to use vulgar words like "fuck" instead of sex, and I said "I assume you mean fuckin lmao." Like it was a joke.. I just didn't want to make it awkward, but now looking back on it, that whole situation was messed up and awkward to begin with. I feel guilty. Maybe me "lmao" made him think it was ok and like I was asking for it since it looked like I treated it as a joke. A year and a half later I still feel awful about it. Like its my fault. I really feel like it is. I shouldn't have been on a adult chat site but I told him my age. But in my opinion it's no difference than someone lying about their age to get a fb account. (10 year olds saying they're 13 etc) I still feel so guilty and disgusted with myself. Maybe I shouldn't have forgiven him? Idk.. I really don't know how to feel