Try and explain what happened at least...

You decide to stand your ground and at least offer some type of explanation for what had happened earlier...

"Sarah I just wanted to apologi..." You say, stumbling through your words...

"Apologize?!" She retorts loudly, cutting you off mid-sentence. "You were watching me undress, jerking off that... Little thing you call a cock!"

Your face turns bright red at her comments...

"The only person you should be apologizing to is the sorry girl who ends up with you loser!" She tells you, trying her best to stab you with her words...

"Sarah... I..." You stammer, trying to get a word in to what is quickly becoming a rant...

"I've got half a mind to tell mom about your sick little fantasies! How do you think she would like it if she knew her son was jerking his pathetic little dick to his sister?!" She says to you, her eyes glaring icecicles through you...

"Please don't tell her! I'm sorry! It won't happen again!" You interject, nervous at the thought of how your mother would react...

"Oh? It won't happen again? How can I trust you after what you did?" Sarah asks you, her frustration and anger visible in her face...

"Please Sarah... What do I have to do to prove it to you? I'll do anything... Just don't tell mom..." You say, your voice deflated as you wish you had just left well enough alone...

Sarah stares at you, her glare making your stomach turn knots... "I have an idea..." She says to you in a rather chilling tone...