Girls, what to do? my cousin saw me naked?

Im a 17 year old boy and my older cousin who is 19 and like a sister to me is over our house everyday (helping my mama). she's usually always downstairs.
anyway I was going to take a shower and realized i forgot a towel.

i thought nobody was upstairs so i quickly tried to run to my room and grab it and right when i did that my cousin comes up there stairs!!

Omg it was so embarrassing, she just smiled and used her scrap to cover he face so quick (which was kinda funny) but I'm so embarrassed. Now she constantly teases me about it and when i try to say

oh be quiet you didn't see anything she's always like I SAW EVERYTHING. -_- i felt like crying when it happened.
Girls, what to do? my cousin saw me naked?
Post Opinion