In all honesty the odds of getting impregnated was only an even risk even if uncontrollable... so after thinking things over and the urges going onward "alright... let's do it" Rachel answered.
"if you say so Miss Sinclair" Frederick agreed as Rachel pulled him towards her clamshell.
Everything from their was after both sides lost all self-control from Frederick's massive cock leaving it's hidden pocket, to the scales covering Rachel's vagina moving away to remove all physical obstacles.
as Rachel lied down onto the since confirmed cosy and inviting soft inside of the giant shell she felt the unmistakable sensation of Frederick's cock penetrating her vagina as he mounted her.
as the shell closed up to give a more private moment the new couple/one-night sexual adventure went full swing with their tails twisting together to maintain unity, both parties giving full blowouts of passion; Frederick not merely giving standard lip kisses but full tongue jobs and breast blowouts/Rachel giving full tongue mining alongside neck, hair and at times back-of-shoulder jobs.
the passion lasted uncountable times to almost endlessly. the tight clamp of Rachel's vagina combined with the strong knot of Frederick's cock inside her, together with the twisting unity of the two tails ensuring this long length. until finally Frederick cock exploded massively into Rachel, powerful enough to finally break the physical bonds right before both orgasmed, extremely more so then all prior times Rachel had remembered doing so... enough to actually create a pulse powerful enough to blow the clamshell back open.
"In...incre...incred...incredible..." Rachel gasped as she and Frederick lay apart on the shell's inside as the orgasms faded. "*heavy gasp* I'll say... I mean me getting this involved is very rare... and yet this is a first in passion outcome" Frederick agreed.
Just then it dawned on Rachel, something other then passion was resulted in the sex... something that fixed her decision upon the final assigned stay if to leave or not...
Rachel was now PREGNANT: