2T4U/Jack/Morning/Melony's room/F-Mel-Missy(r)/Switch/Push it in
Now with your mother's permission, no, her encouragement and blessing, no, not that either, on her implicit orders you begin to penetrate your 6 year old sister again. Missy lets out a miserable moan of protest and her body writhes as you press against her. Between her fidgeting and the slipperiness of your little tad-poles dripping from her tiny slit, your dick-head only deflects off and you are once again unable to get inside her. As you begin to line it up for a second attempt, your mother immediately joins in on the action.
“Hold still girl,” she groans in frustration as she presses down on Missy's mons with both hands. She looks back up at you with a smile and encourages you on. As you begin to approach, your mother actually takes your dick between her thumb and fore-finger of each hand and guides you into position while pulling Missy's labia apart with her ring and middle fingers. Seems now all you have to do is push, and with a little bit of pressure the same jizz that made you slip off course the first time helps to lubricate your way in this time, and somehow with your stuff already in her, her insides seem to feel even warmer and most certainly wetter this time.
“MMMMmmm...” Missy moans miserably as you stretch open the first grader's baby-chute for the second time in mere minutes.
“Oh, yes!” Your mother crows, “Hmm..” She begins looking at you with soft bedroom eyes, “Oh you like it being sheathed inside your little sister's tiny body, don't you Jack?” She begins grinding her hips against Missy's chest, causing your little sister to begin sobbing and moaning under her. “Go ahead, plow her hard and dump more of your goo inside her.” She seems to be looking at you with some expectation, and suddenly you find your libido rising. You can feel your balls tighten and your dick tingles with a powerful urge to do exactly as your mother just said. You have every indication that Missy is feeling absolutely miserable from what the three of you are doing with her, but your ability to care about that is just becoming more and more distant as the intense sensations in your groin urging you to fuck hard and spew your cum all over inside your kid sister you are essentially gang-raping.