I fell in love with my friends little sister, help?

Lauronnao
I (22) have become really good friends with my colleague (22) before I knew his little sister (20). I started talking to her a lot through chat when she also started working the same job as me and her brother. We really clicked.

We went to have dinner with the two of us for a few times as friends (i didn't want it to be a date, because it is the little sister of my friend). Texting can go on till we fall asleep and it has a lot of teasing in it. And we always say goodmorning and goodnight to eachother.

I am pretty sure she likes me too. She is always smiling and likes my company.

Today I went to play some pooling with my friend and his girlfriend. Also his little came. She was so beautifull. I have never seen her like that. and i am pretty sure she had thought about what she was going to wear.

I wanted to tell her she looked gorgeous, but I didn't. Because her brother/my friend was next to me. This moment made me realize I fell in love with her, but I am scared of losing my friendship with her brother. I don't know if he would like it if I hit on his little sister. And i am also scared that he will forbid her seeing me after I tell him.

How do I need to deal with this?
I fell in love with my friends little sister, help?
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