[Sans is struck with the idea that he might have caused this. That and the memory of the leeches, returning unbidden, makes him jerk away, almost falling off the couch. Being separated from Papyrus even by this much doesn't do anything for his nerves, but for now he can ignore that.] Did I infect you or something? [There are no black spots on Sans, at least in any visible areas. Sans looks down at himself like he might see something, but there's nothing. He was able to sense a leech in him last time. Wait, no, it couldn't be the leeches, Sans hasn't been in the lake and he stays out of the water in the cave. Leeches can't leave the water, right?]
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