Say you'd been naughty, and had to have your bottom spanked.
No, but seriously, the wrestling excuse works. Just say her mum was pretending to be hurt, and that your butt was bare because your pants fell off in the middle of a match. Or that you were just playing some game kids aren't allowed to play, but that one could lead to awkward "how?" questions. The "dreaming" one will stop working eventually.
Only other thing I can suggest is you try more quiet stuff.
Never been caught... just always disturbed when doing things alone. Even when the ****ing house is empty, the postman has to pick his moment to deliver something doesn't he?
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