On the subject of ovi cock birth... a guy with a big clutch of eggs growing in his round belly fucking someone, not realizing he has to lay them now. Maybe he knows it's not far off, or maybe he doesn't even know they're inside him at all. He definitely has no idea that as he thrusts into them, his eggs will start moving down, stretching his cock from the inside. He groans from the discomfort, and his partner is confused feeling his cock beginning to bulge inside of them.
They feel the first egg slip into their womb and gasp, telling him to stop, but he can't. He's panting and moaning, stuck fucking his eggs into them regardless of if either of them wants this. His biology forces him to stay inside, to keep birthing inside of them until his belly is flat and theirs is swollen. Before he can finally pull out, he cums, sperm flooding their egg-filled womb and fertilizing each of them.