[Asami]

So the past few days my brothers childhood friend has been staying with us and will be staying for I don't know how long. They've been the best of friends for the longest time. Well what's wrong with that?? Well ill tell you..

It all started when he added me on facebook a long time ago. We talked a bit and he confessed he had a huge crush on me when we were kids. He told me when we were in high school the reason he let me put my armwarmers and makeup on him was because he liked me (I don't really remember this memory. I only remember the armwarmer part). It made me laugh. We talked more, I only really wanted to be friends with him but apparently he didn't. Things started getting creepy. He told me how when we were younger he snunk into my room one night (or more) and contemplated laying down in my bed and kissing me and other stuff. I felt the red flags go up but I thought. Oh well ill never see this guy ever again. So I started ignoring him but he kept at it. I told him I have a boyfriend(which he knew) and he got pissed. He wanted me to leave Mike for him. He kept saying how he was better ect.
I told him all I wanted from him was friendship and that was it. So he stopped talking to me.

I thought everything was good until one day Stefan comes upstairs and tells my mom "hey _______ is visiting family close by can he stay with us for a while?" Of course my mom agrees while I secretly freak the f*ck out. So I go on facebook and message him telling him he had better stay away from me and not even look at me. Which he replys saying "cold much?" So the first day comes and I do my best to stay out of the house. I go laser tagging with friends, walks ect. Come back no contact whatsoever. Im happy. Next day I get a message from him saying id better sneak him hugs while Stefan is away.
I feel nervous.
He joins me on my walk because my mom wants him to get shown around.
that night isle stay up watching anime and he joins me as well. Then says "you'd better hug me" so I do..
The next day passes with barely any contact. But he messaged me telling me that I have to hug AND kiss him now.
Now its today and im so scared. He keeps telling me he wants to kiss me. I don't want this. Im so scared but I CANT ruin this for my brother. Im so afraid...

How do I tell him no to make him stay away. What if next time he asks for more? What if he comes into my room in the dead of night and does something... I don't feel safe anymore...