I have been noticing my underwear going missing for a while, and earlier I found a pair of my knickers in your bedroom. I ask you what you’ve been doing with them. I notice that there are some cum stains on them, and confront you about masturbating in them. I speculate if you have been wearing them too - do you get aroused by feeling feminine like a sissy? I order you to put them on, and notice how your tiny penis is so rock hard. Oh dear, is that why you have to wear panties, because it’s so small? I order you to show me what you’ve been doing in them and to start wanking in my knickers - your own mother’s! I mock your tiny penis and your wanking, and then ask if part of the reason you steal my knickers is because you have a thing for me, your mummy! I tongue kiss you on the mouth, then move back and slowly put my hands down my knickers and start masturbating myself, telling you that this can be our naughty little secret. Holding up the knickers, I tell you to 'cum in your mummy's knickers’, mocking you for the fact that you’re crying out 'mummy! mummy! mummy!' as you orgasm.