[Jam Natsu (Natsu Jam)] The Forest of Sacrifices [biribiri]

The village chief's son discovers why the forest demands sacrifices when its resident entity pins him down and declares his young body ideal for bearing its spirit-children. Swarmed by eager tentacles and seeded with clutch after clutch of eggs, the slender tomboy's belly swells across two hidden weeks until he's tearfully pushing out the last oversized egg in a shuddering anal birth. Back home, the villagers whisper about beasts and pray for his parents, never suspecting what the forest is quietly incubating.