Against your better judgement you found yourself sitting there watching the scene develop further. Monica had backed up off of Jenny's lap, standing up bent over the massive cock. Though her progress was slow, Monica was actually getting more of Jenny in her mouth. First managing to get a nice five inches in her mouth before reeling back and trying for more. Jenny now had both of her girly little arms pressing against the back of Monica's head. Monica marched ever further down the shaft which was starting to stretch her jaw to it's limits not even half way down. At about inch eight Monica pulled all the way off and looked away blushing.
"I never asked you to stop." Jenny said almost commanding.
"It's getting really hard to breath with you in my throat girl. Plus your filling my mouth all the way and it's getting dry and hard to move on at the end. I've never had such an issue...I don't think anyone has had this issue considering the tree trunk I'm working on." Monica seemed extremely flustered at this point.
"I think you can do it, sexy. Plus you want to do better. You want this." Jenny was sounding like a completely different person at this point.
Monica doubled her efforts from last time, moistening most of the length of the shaft before sticking it back in her mouth, taking a good six inches in the first move. In the in a matter of seconds she'd broken hey old barrier and was nearing the half way point when she got down to her knees and reply leaned into it. You noticed a large knot in Monica's throat moving back and forth with her dick sucking. Jenny was in ecstacy with her head back and eyes closed muttering something to herself, her hands checked tightly at the seat of the chair. You were in awe at the display in front of you. Your sister has lasted almost two whole minutes, one for each foot of cock, and Monica has gotten over a foot of cock into her mouth at this point. Monica began to back off entirely and catch a deep breath but Jenny was not going to have any of it. No sooner had Monica stopped inhaling and reached the head of the cock that Jenny got to her feet and moved forward. Jenny grabbed Monica by the back of her head with one hand and applied pressure again, seeming more intentional about it than out of natural instinct. Monica was resisting slightly at the lack of air she had and did her best to get back to the tip. Jenny stopped her short, took one big step forward and shoved the entirety of her cock in Monica's mouth with one fell swoop. Jenny threw her head back and breathed "Yes!" While Monica released a powerful squeal at the ridiculous amount of cock that was shoved into her mouth, snaking it's way through her throat and past her collar bone. Monica could've sworn she felt it in her ribs. While there was a chance Monica popped off the cock and stumbled backward onto her plush rear.
"I need more warning that that, girl. You could've choked me out." Monica said.
"I need more work than that." Jenny said, now confidently stroking her cock. Her rod was shiny in odd places from the spit that still hadn't dried and her hand was picking some up with it, making slight slapping noises along the way. "And don't you dare for a second think I can't choke you to death on this cock. You insult me. I can do anything I want with this. You're only breathing because I don't want to lose you. Get on the bed."
"Damn girl, I must've got your testosterone flowing. You're bossy right now. How long do you last though?" Monica questioned.
"Much longer than you can, that's easy. And a lot longer than John ever could. So...much...LONGER than John." Jenny was into it now.
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