Naked in bed and a plan

Thinking for a second, you pull out a lust potion. When consumed it will take 30 minutes to kick in, upping the targets sex drive and increasing their stamina. Smiling, you begin your plot.

Walking downstairs, you hear your aunt saying she'll be out the house till tonight, going to some sort of gardening event with some of the other ladies on the street. With Dudley spending most nights in bed wanking off, this is a perfect time as your aunt heads out. "Uncle Vernon, one of my school friends will be coming today to check up on the place, I'll be out of the house while they do. Too much..... freakishness messes up the check" you say, watching your uncle bristle and go red before nodding his head and going to his paper.

As you slip into the kitchen, you draw out the potion and dump it into the frying pan currently cooking up bacon for Dudley's and Vernon's lunch. You smile as you imagine your fat whale of a cousin beating his meat helplessly into the night before going back upstairs and waiting for the lust potion to kick in before turning into Hermione.