I'm 15 and my sister is 16 and i think i fancy her. When ever she has a shower or a bath i always look through the window above the door to watch her. I always get hard and cant control how hard i get. Is this normal or do i need to see someone about it. Ive seen her masterbate several times but she doesnt know about this.

-I thought I caught you on the counter...
Wasn't me!
You should wreck that chick, then your kids will have no eyelids and speak backwards, all in all, a good result for the team!
sorry. But what im saying is just do her... f*$@ her man. if shes hot then damm right stick yo finger up her p@s*y