My baby siter having in my house !!!!!!!!!!!!!!!!!!?

i must have been six and i was out whith my friends wen i came home ii was listening 2 gns on my headset and wanted beef jerky and a soda i didnt hear because of music so i was whithout a warning! when i see my hot babysiter and her bf doing it on the floor i didnt now wat was hapening so i tapped my babysitter on the shoulder.they both screamed i ask why then were making sound like tht like ahhh and oooo i ask if i could play and thought they were playing leap frog and they yelled no and the bf leafed i have had lots of these u can check on my profile but i need to now how to tell to my mum its been many years but i feel the need to tell her i dont know how to break it to her i still have those visins but il ike my naked babysiter shes was smokin! but it creeps me out please good advice