The pretense behind my idea is fairly simple, since I'm just in the mood for some hardcore perversion. Yeah I know. Me? Hardcore perversion? Go figure.
The Lords of some solar system are in the process of "creating" a new planet, so to speak, and are going to populate it with all sorts of creatures they can breed for war. They have abducted one relatively unremarkable female from a separate world (my character) and are basically going to put her through the ringer. They toss her into a research facility along with droves of horrifying, monstrous, brutal alien creatures to determine if they can be cross-bred with a Human in an attempt to make them more Humanoid.
Of course this means lots of NC, rape, gang-bangs, monsters, aliens, tentacles, multi-penetration, giant cocks and spooge! Also, Human's being the fertile individuals they are apparently, will mean my character gets pregnant with dozens of monster spawns, but due to the nature of the facility, the birthing process is extremely fast (like, an hour at most). So, add heavy lactation and impregnation to the list.
If anyone wishes to take on the role of some monsters, prepared to sow their seed into the womb of some poor abducted and unsuspecting lass, just let me know either through here or through PM.