My sister saw my erection?

Anonymous
I come home very rarely, even if I stay I never used to sleep at home.. So, recently I slept at home. Morning my younger cousin sister came to wake me up and pulled my sheet. Tadaaa... She looked at my erection, threw back the sheets at me and went out laughing.. I feel awkward after that incident.. She reacts as if nothing happened... Should I say anything to her?
My sister saw my erection?
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