Help her

You are shocked by seeing her huge dick that would dwarf your own easily in girth and length and are even more shocked to hear your little sister to ask you to help her cum you are almost too shocked to even say anything but you finally look away from her monstrous cock and look at her poor pleading face. She needs your help more than ever and she was so brave to ask you for help through her eminence embarrassment you can't just leave your sweet baby sister like this, what kind of big brother would you be if you just left her in pain and in tears.

"Yeah.....I'll help you." You say almost with regret.

Her face lights up so brightly and a big smile goes across her face her eyes open wide and she lets out a girlish squeal of excitement. "Thank you! Thank you! Thank you! You're the best big brother ever! I love you! I love you so much" She exclaims in excitement and throws her arms around your neck hugging you with all her little might.

You blush at her reaction and her words to you. "H-how should I start? Should I just...use my hands?"

She bounces up and down her big throbbing cock bounces with her as she exclaims "Yes! Yes! Yes!"

Still sitting next to her you move your hand onto her dick and grab it towards the middle instantly you feel just hot it was and when you get a grip you can even feel her racing heartbeat through it. Sarah lets out a gasp and moans "Ohhh!" as you then start to move your hand up and down and stoke her cock, her dick was so smooth your hand just glided so easily up and down even without any lube. "Oh yeah! It's just how I imaged it would feel this is awesome! Keep on stroking it! It feels so good!" She says and her cock starts to leak drown onto her shaft and onto your hand creating an even fast and more smooth glide than before. She cocks her head back and starts to moan and she starts to thrust her hips up and down fucking your hand while you stroke it from base to head more and more pre leaks out as if it were a lube dispenser, your hand gets tired from this position so you decide to get on your knees on the floor and begin using both hands for her huge cock, you keep stroking her in this position for 10 minutes your arms growing ever more tired trying to clam your little sister's beast.

"Oh! oh! Oh god, this feels so good! This is the best! I-I think I'm getting close try using your mouth!" She moans out

You try and protest and open your mouth to speak but just as you open up wide she grabs your head and shoves her cock deep down your throat, in one swift push she sends her whole length down your throat and your chin meets her big overfilled balls.

"Ohhhh! ohhh god! I'm cumming! Your throat is so tight and warm, just like I dreamed!!!!! I'm cumming!" She cries out in bliss holding your head down with all her might her legs flying in the air and her body curls in on itself. Her cum is shot straight down your throat directly into your stomach as she moans loudly her head cocked back looking at the ceiling with her eyes held shut. She's so backed up and filled with cum not having cum in a month she takes her opportunity and unloads an ungodly amount of thick semen into you, gallons and gallons of your little sister's baby batter is pumped down her cock straight into your gullet and into your tummy. She pumps so much girl cum into you that your stomach literally starts to bulge and inflate as it is packed with a month's worth of your little sister's cum. Finally with the last few pumps of her hips to make sure her cock was empty she lets go of your head and you throw your head back unsheathing her softening cock gasping for air that you were desperately lacking for who knows how long, you cough out a bit of her semen onto yourself and continue gasping for air as your belly is unbelievably full making you look pregnant.

"I'm sorry! I'm sorry! I didn't mean! Oh god, I almost killed you I'm sorry! Don't hate me! Don't hate me! I just got carried away its been so long and it felt so good! I'm sorry!" Sarah desperately pleads to you as you **** for air, as she gets on the ground with you and holds your head to comfort you as you cough and gasp.