The extra cum in her stomach fills her so full she fears she'll burst.  Laying on top of the mound of her stomach makes it ache and forces her to cry out over the top of the tentacle stuffed down her throat.  Then he comes inside her rear and the pressure grows even more.  She's so full with this creature's fluids, she's certain she'll pop like an over-ripe tomato.  Tears begin to trickle down her face even as her hips begin to buck against the ministrations of his tentacles.  She tries to flip herself over, to lay on her back and release the awful pressure on her front.