How to avoid Tan Lines this Summer!?

I am a 16 years old guy and live in Canton, Ohio. Right now it is about 85 degrees and up. We have a beautiful pool that is sheltered by 15 foot bushes and shrubs. I have gone out the last 2 days (Sat+Sun) from 1 PM-5:30 PM in 90+ degree sun without sunblock, tanning oil, or anything. I just wore a bathing suit. I have a terrible tan line and it is very embarrassing for personal reasons. How can I tan completly naked without anyone knowing??? I don't think my parents will let me, but i need a sexy tan,