You and your sister always play these gross games where you have to jerk and you're not supposed to cum to prove that you don't like it. She calls you into her room and she's wearing a see through dress. You're instantly hard and it's time to hold your dick in your hand and try not to stroke. She only lets you stroke when her ass is shaking. As you're getting close, you hear the garage open. Your mom is home and your sis doesn't have a lock on her door. You try to put your dick away but your sister whispers angrily to keep stroking and sniff her ass. You end up cumming all over your sisters ass with your mom right outside the door.
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