Why not make them enjoy it a bit more?

Their suddenly vociferous moans filled the air.

"Where is that you had to go again?" I ask, amused by their quick loss of dignity.

"Nowhere! Just keep goooooo..." Jessica's request trails off as I hook my index finger, pushing on her inner walls. With a thought, they cum simultaneously, drenching my fingers with their enhanced juices. As they come off their high, they both straighten, and "remember" where they're going.

"Alright Jessica, we'll be late to our public masturbation seminar at this rate." says Mom, as they hurry out the door, underwear still missing and skirts disheveled. Fun, but kind of short.