[Saito Yahu] Alien Seeding Experiments 1 [Full Color]

Rika, a curvy schoolgirl with purple twintails, gets cornered by a squad of big-eyed gray aliens who promise their experiment won't hurt—no implants, no blood draws, just five little minutes for the sake of progress. Soon a strange ingested liquid has her flushed and pliant as a squelching mechanical probe is unveiled, while two older girls already deep in the program writhe under wriggling pink tentacles, moaning and begging for the 'experiment' to continue. Rika wakes in her own bed praying it was all a dream, only for her cheerful gray visitor to reappear with special orders to keep researching the reproductive nature of humans—starting right now.