the Grey's Martian home world is dying out and needs to be repopulated soon!

These foolish Aliens have just abducted Earth's sexy mature females for breeding stock!, but they are both well past their prime for that.

“Realizing” their mistake after extensive experimentation, these two sexy big breasts Grandmothers are cast off as pleasure sex slaves instead..

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If they have the biotechnology to breed with other species, you'd figure they would have rejuvenation biotechnology to reverse menopause. Might be fun to see an expression of shock and horror as they show the signs of being pregnant, as an alternate version.

Base +6