>>149644087
A pharmacist.
Joyce needed contraceptive to help her deal with her menstrual cramps, but she didn't want other people to think she were buying them to have sex so she asked Dorothy to pretend they were a lesbian couple so that the pharmacist wouldn't assume she were buying them for the purposed of getting a penis inside of her.

The other person in the strip you are quoting is the Pharmacist's wife, only featured in that comic.