One cool mechanic you could add is some kinda "slut meter" showing how horny Candace is. Fulfilling requests, picking the slutty responses to questions, and just fucking your coworkers fills up the meter.
Each rank in the meter permanently reduces efficiency by a bar during that level(cause Candace's horniness distracts her), but unlocks actions that will help you fuck your coworkers quicker, saving time and making up for the reduction in efficiency.
The actions could be like, letting you get fucked or do a titjob even with clothes on, or letting you take care of multiple coworkers at once so you don't have to fuck them one by one.