[Hyenadog]

Hitsugi could feel Lucien shoving against the emerging baby, breath hitching slightly between strained moans. He wasn't expecting the man to thrust so hard, eyes shooting open as the baby was pushed back up into him. He gave such a high pitched cry, his whole body tense and clenching around his cock.

"Sh-shit!" He gasped, managing to lift himself a bit as Lucien started grinding into his prostate again. He shuddered as he pushed again, the baby sliding down further, forcing it's way between Lucien's cock and his prostate. Hitsugi gave such a strained moan, feeling so full, the baby pressing against his prostate now. His own cock throbbing and twitching between them while his slit started to bulge out against Lucien's body.

(Just pointing out his prostate is still in the normal spot attached to the bladder, so the birth canal is between it and his rectum.)