cw incest, dad/son, brother/brother, omegaverse, breeding kink
alpha!Robby comes home to find his alpha son balls deep in his omega son. This wasn't an unusual sight, except Frank knows he’s not supposed to play with Dennis anymore now that he's had his first heat. But Robby knows how alpha ruts work after all so once he scents his sons and his own rut hits, he flips them over and fucks Dennis's mouth while Frank ruts into him from below. He loves feeling his omega's mouth wrapped around his swelling cock while his oldest son strains up to lick and suck his balls, but even Robby can't resist the siren call of Dennis's hole for long. He pulls out of his mouth while Frank keeps fucking him from below and kneels between his sons' spread legs to line himself up. Robby slowly works his cock in beside his son's pistoning knot until Dennis is spread wide between them then leans down to mouth at Frank's lips as he fucks his knot to fullness. “You wanna get your little brother pregnant, huh? You wanna fuck your pups inside him?” Frank comes hard with his dad’s words in his mouth, his little brother's hole squeezed around him, and his dad’s massive knot pulsing against him inside their shared omega.