"yo that sister is crazy i never did anything approaching that"

or it could be

"that's something i did that im really not proud of and XYZ is why ive grown since then and you deserve my sincerest apology for my behavior"

or it could be

"i thought we had something between us that we clearly didnt in hindsight and i didn't realize she was asleep"

or it could be

"my issues with drinking in the past are well documented and i dont remember doing this but i absolutely could have and im ashamed"


etc etc etc. There's another side attached to that dick in her face, whether you want to admit it or not.