Sans had been sent to the lab you work in was relaxed as hell, normally they would get sirens that get paranoid or aggressive as hell, but he just slept. . .

When you went to the upper levels of the tank & opened the lid to extract some of the sirens saliva, as a joke when you were taking his saliva, Sans jokingly gave a small lick to your lips, knowing damn well of the properties siren saliva has. . .

• . . . Heh, feeling anything yet land creature? . . . -

He said with a grin. . .