His two sons

Jack heard his two sons outside enjoying the hot tub during their last weekend of winter break before heading back university, he walked downstairs to the patio to join his sons. The boys were drinking and chatting about life, when they turned to their father, strangely more fit and seemingly glowing with a bright loving smile on his face. It was unnerving to say the least. Thats when he dropped his towel and exposed his lengthy, flaccid, shiny cock, which was now gushing the slick ooze.

Before the boys could usher a scream, silver semi-translucent tentacles erupted out of the father's asshole, gushing alien fluids with the handful of thick tentacles. They lunged and rammed down the throats of his sons, with the accompanying tendrils wrapping around their arms and legs, holding them in place as to not make too much noise or have a hope in escaping what happens next. With their screams muffled, the father started to orgasm and pump the alien slickness out of his ass and down into the tentacles that were stuffed down their throats. The semi-see-through nature allowed everyone to see the the liquid bliss flow and pump all that way into the sons' mouths, just like what happened to himself a few minutes ago. Once the tasty goop flooded their throats, they started feeling the same intense heat, and the same blankness in their minds as their eyes rolled in the back of their heads in bliss while they started shaking in orgasmic shock.

The tentacles holding them in place eased as their minds were being reprogrammed, their father got closer and started stroking his snake like cock, pumping it and feeling the pure argent cum start unloading faster and harder with every pump. His cock getting harder and longer till it was full erect and impossibly long, spewing gallons of alien love over his sons faces, chests and into the water. With every pump meant another orgasm, and with every orgasm more alien sludge filled their stomachs to the point where they were bulging.

The two alien sluts came to, their eyes rolled back and the alien tentacle slid out of their throat, which unleashed a spew of hot shiny corrupted spit up out of their mouths and over their chest. The tentacles slid down to their cocks, which were just starting to get coated in the silver slime. As they stood, their normal sized cocks were engulfed in the tentacles as they started moaning to the sucking sensation their father was giving them through his enhanced body, all while he was continuously unloading on them in the tub. Within the tubes you could already see the alien corruption making quick work of their previously human sexual appendages. What was a normal penis was now swelling to a long shiny, thick cock, swollen and pulsing with every heartbeat, ready to unload into someones throat, face, ass... anywhere on anyone. Their fathers cum coated their balls, which quickly swelled up to the size of softballs, all while the they rubbed their fathers alien cum over their skin, feeling the heat and bliss of how smooth and oily it was.

The brothers sat back in the tub and started rubbing it into each other while sloppily making out and spitting up their fathers cum into each others throats, swapping slick loads back and forth. Their long slender tongues explored each others mouths and throats, tasting every bit of the delicious fluid as their cocks neared completion.

Once their cocks were fully corrupted, the fathers ass tendrils slid back into him, his cock retreated to a humble long drooping rod of thick softness as his sons stepped out of the tub with their new alien cocks/balls/asses/stomachs/tongues... Naked and exposing their alien glistening bodies.