[HEATWAVE (Kaitou Yuuhi)] Breeding Boys [Black Grimoires]

Two crossdressing shrine boys slip past a No Trespassing rope into a forbidden cave, one hoping to reach his friend Naho before whatever called her into the dark claims another victim. Instead a lurking tentacle monster drugs them, purrs about loosening their bodies until they are fit for childbearing, and works bumpy tendrils into their tight asses and even their urethras until both tomgirls are sobbing through egg-stuffed inflation and heart-eyed ahegao. By the time the creature crows that its children will soon hatch in their bellies, the rescue mission has become a breeding ritual neither boy can resist.