2T4U/Jack/Morning/Missy/Try and get a sleeping blow-job
You move in closer and touch the head of your cock to her lips, leaving a trail of pre-cum all over her nose and lower jaw. You feel your balls give a sudden twitch. You are relatively certain it is not going to be anywhere in the same category as any of Brittany's blow-jobs, but the temptation of face-fucking your sister while she is asleep and unaware has you already on the edge of blasting your cum all over her freckled cheeks.
You try for a moment to tilt her head towards you while separating her lips with the head of your dick and brushing it over her teeth, but you realize very quickly that is probably not going to work. You throw a leg up over her body, keeping your other foot on the floor. This sudden tension forces the zipper of your pants up into your balls, but somehow the sensation actually makes it feel better. Now you are half-straddling the 6 year old, hovering your hips just over her chest as you are held up by your knee on the far side of her body.
You gently cup the back of the red-haired first grader's head, her mouth pops open with a slight wet popping sound as the back of her throat opens up and air begins flowing through her mouth instead of her nose. You clutch your dick in the pinkie and ring-finger of your other hand as you gently fit your index finger between her teeth and pull her jaw open. You move your hips and hand forward and squeeze your middle finger in to join your index finger, and this provides you just enough leverage to spread her jaw and guide your dick in. With a thrust of your hips, the bullet-shaped head of your dick does the rest. It is not the most pleasant thing having her teeth scrape across the sensitive tip, but it is not really all that bad either.
Your little sister begins to make some snorting sounds as the intrusion of your dick re-shapes the angle of her jaw and, as a result, the back of her throat as well. There is something that just seems perversely precious to you about this, she is snoring while you fuck her face. You can feel the blood rushing to your cheeks and ears as they heat up with the euphoria you find, it is actually somehow cute seeing your little ginger sister's sleeping freckled face spread open around your cock.