I think she should have been forbidden from wearing any underwear beneath dresses, not just that one, so that you....or any other man you permit....has immediate access to her cunt and arse, to feel with their hands, taste with their tongue or fuck balls deep with their cock. Pull it up and expose her fuck holes.......or she pulls it up to show anyone you tell her to. When she needs to piss, she just squats and lets it flow, no need to remove panties...then stands up and carries on. After she has taken your sperm, there will be a trickle of cum droplets running down the inside of her legs or on the ground beneath where she is standing. I love her dirty underwear....but in dresses like that, no panties, immediate cunt and bum access, slut! Emma leaves a trail of sperm warm from her cunt or bum on the ground behind her. If she sits, when she stands up there will be a damp sticky patch on the seat and her dress will stick to her buttocks. Everyone will know she has been fucked.......they can see sunk on her dress, smell spunk and cunt on her.....and your semen will be great lube for the next man to ram it into her.