My Step-brother is always checking me out?

Anonymous
The woman my dad got married to has 3 sons.. 13, 15, and 17 years.

The 17 year old is always checking me out. When I'm standing talking to someone, I can see him looking up and down from the corner of my eye.

He has a girlfriend to make it worse... lol.

What are his reasons for checking me out?

Just likes the way my body looks I guess? help I feel clueless...
Updates
+1 y
STEP-siblings means not related by blood AT ALL. He has his mom and dad, and I have mine.

No genetics are shared here.
My Step-brother is always checking me out?
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