Of course they obey.

The two women stay kneeling in front of you, their faces glistening with your seed. Without a word, Gemma leans in, her lips meeting Rebecca’s in a slow, deep kiss. Their mouths move together, their tongues swirling as they share the taste of you, a web of thick threads of cum stretching from lip to lip. As they pull apart, a thin strand of cum stretches between their mouths, glistening in the dim light of the office. It snaps, but neither of them wipes it away. Gemma leans in and sucks a strand from Rebecca's chin, the sticky globule smearing across her lips before she returns for another kiss. This time, as their mouths meet, Rebecca’s tongue darts out, catching the cum on Gemma’s lips and pulling it into her own mouth.

Gemma responds by spitting a thick rope of cum back into Rebecca’s waiting mouth, the liquid dangling from her lips before Rebecca swallows it down with an obscene moan. Gemma goes again - spitting into Rebecca's mouth, their lips and tongues playing with the strands of cum. A thick glob catches itself on the bottom of Gemma's lip, and Rebecca leans in and catches it, your seed stretching like an alabaster thread before snapping into her mouth. She swallows with a contented sigh, her eyes half-lidded with pleasure.

Not to be outdone, Gemma's fingers scoop up your cum from her cheeks, pressing them to Rebecca's lips. Rebecca takes them in her mouth, her tongue swiling around Gemma's fingers. She returns suit, her fingers collecting the remnants from Gemma's chin and scooping them onto Gemma tongue. Their mouths meet again in a deep kiss, their lips parting just enough to let the cum stretch between them. Gemma pulls back slowly, the strand elongating and thinning until finally it snaps, flicking onto Rebecca's chin and neck.

With all but a mouthful of your cum swallowed down, the two begin to spit the last clump of your seed back and forth between their mouths, spraying each other's lips with spit as they do so. As they pass it back and forth, it appears to grow in size as it accumulates more and more of their saliva, until finally, after twenty, thirty, maybe forty passes, their lips meet for one last kiss, their tongues exploring each other's mouths, sharing the last morsel of your cum between them.

"Well done, darling," you praise Rebecca, opening your drawer to reveal an array of tools. "But you have a lot more to learn..."