Fuck! No sooner had she got right back to doing what she was doing with Scarlett’s cock than her sister had upped the ante and done something more to her.  Emily moaned loudly right into the slit of her sister’s cock. Emily had never really been much of a ‘ball’ person. She’d seen in porno movies that women sometimes sucked on them and played with them (yes she’d seen the odd porno movie. For some reason boys wanted to show them to her) but she’d squeezed her own when she’d been masturbating before and hadn’t really found it all that interesting to be honest - or to feel anything much at all. Clearly she’d not been doing it correctly.<br/><br/>Scarlett was squeezing and rolling and caressing her balls so much that Emily thought she might loose it right there and then, she could feel them tighten, at least, but that might have just been a reaction to all that squeezing?<br/><br/>No… In actual fact, while it might have been related, it wasn’t the reason why her balls tightened. Her balls tightened because she was about to cum once more. Cum inside her sisters mouth. She had barely seconds left before she was unable to do anything except spew buckets (well, squirts) of her cum into her sister. She couldn’t tell Scarlett about this - she had her mouth full and her hand was going lightning fast jerking off the slice of shaft that wasn’t in her mouth. She could squeal though, and so squeal she did in the hope that Scarlett realized what the squeal meant and would take whatever action she deemed necessary to take at this point. Emily hoped that all she’d do would be to open her mouth wider so the cum could squirt all around it and splash down her throat and spew into her tummy.<br/><br/>Aieeeeeee!!!!!! That super naughty thought tipped her explosively over the edge and she started spurting and squirting and cumming into her sisters hot and waiting mouth. The one thing different about futanari girls to regular boys (aside from the fact that they were girls and not boys, of course) was that futa cocks never seemed to suffer from reduced cum flow. The could cum again and again and again for orgasm after orgasm and each and every ejaculation would be more or less the same volume of cum. In Emily’s case, quite the large spurts of wet, sticky, cum. Some people’s cum was borderline solid. Some people’s cum could splatter against the wall and stay there. Emily’s was much less viscous than that. Her’s could splatter against walls in torrents but would start to dribble and trickle down the wall almost immediately. At any rate, it was now spurting and filling up Scarlett’s mouth and throat. Emily wanted in on the action too. She wanted her sister to cum in her mouth so much she could squeal. She did squeal actually. All over again.