The blob takes over his genitals.

The scientist easily tracked down the slime. Scolding it gently as he began to relax. Deciding to use the slime for a bit of pleasure.

As soon as it hits his junk,it spread around and coated his entire genitalia. Slowly coating it, and gently slides into his cock. The scientist gasped and tried to remove the slime, but it was too tightly bound to his body. He could not grip it. As it enters his body,it splits in two. One half going into his testicles, the other his bladder.

The testicle goo quickly envelopes and assimilated his balls. Turning them soft, squishy and turning his cum into goo.

His bladder goo quickly did the same. Assimilating his bladder and taking control of it. Corrupting his kidneys as well,so even his urine was goo.

His cock quickly became soild black. As did his sack.