Sniff the panties
From Create Your Own Story
You look at the inside of the gusset where her sweet virginal pussy had been maybe only earlier this morning. A couple of blond pubic hairs are stuck there. Almost by instinct, by an insatiable desire caused by more than year of fantasizing about your younger sister, you bring the crotch of her panties to you nose and inhale deeply until your lungs are full. You look at them like you're studying a sacred text, amazed at how horny they made you, your cock fully painfully engorged. You then repeat the action, pressing them hard to your nose and inhaling deeply. There is an odour, but you sense something else, something on an animal level causing a deep stirring, her hormones, maybe.
"She must be in heat, fertile." you say aloud to yourself, trying to understand the effect they have on you.
You lick them once, twice, "God, I need to lick her. Please God, let me taste her." you pray. You don't even believe in God anymore but realize you have been suppressing your desire to defile your little sister.
There's a noise behind you.
you turn and there in the doorway, her eyes bugged out of her head is ...
