Walked in on aunt and uncle!!!!!!?

I had to give something to my cousin because he left it at my house so my mom had me take it in to him so I walked in the door and I see them laying on the floor making out half naked so I throw my cousins wallet and run in the rain and get in the car so we could go and they didn't see me until after I left bc I threw the wallet so Im really embarrassed so what do I do and how do I handle if and I didn't tell anyone