This is a bad one. I don't know if it's here or some other manga site.
The main characters lives only with her dad, the dad has a bondage fetish and since his wife died he asks the daughter to tie him up. The daughter/MC goes to school and sits nexts to this girl. She also has a pet play fetish and has a "dog" of her own. The MC is in a shop going to buy some new rope and walks out of the shop and bums into her classmate. Rope falls out of her bag and she doesn't realise. The classmate follows her back and shes her doing bondage on her father.
Anyone know what manga this is?