Boy asked me if I finger myself?

I was on snapchat last night just checking all the my stories and a boy who I go to school with (it's the summer holidays just now though) put on his story snap for facts so I asked him for facts and he is so so popular and I have spoke to him befor in real life afew times but I'm not as popular as him but I am popular and I had my first kiss the other week I'm 13 14 this month actually and so I asked him for my facts and he said "well good looking , Such a nice girl , well fit , ride , should snap me more " I was like aww thank you!x and the. He said Nobother babe do it back 😏x and I said well good looking so nice good laugh should snap me a lot more x😏 and then he is like thanks babe what you doing 😏x and I was like holy **** he is so popular and is the one keeping the convo going and I have to admit I used to have a major crush on him so I feel privileged then we are talking a little while and he then goes this thunder and lightning is so scary and I was like I know right then he saiou should just come sit with me and this is like 12 at night and obviously h isn't being totally serious and I was like yeah I suppose and then he said what would we do and I went whatever you want and he said do you finger yourself and I said that's a little personal babe and he went I would do it for you any day and omg I wouldn't never let him near my private are because I'm not that kind of girl but I thought he's probably touching himself what will I say if he asks again help