(image by brbnk2k, characters originally by fallus design on pixiv) bigail is your armless mother and ember is your adopted paraplegic redhead catgirl older sister. since ember is a catgirl she has an innate need for headpats but the two of yous mother bigail has no arms and you can headpat her which she appreciates but has never gotten headpats from her mother. but your mother is a great retired scientist/engineer so she can come up with stuff quick, and for abigails headpat problem she created, with your help, the "headpat-o-tron" which basically is saying "No arms and - perhaps more pressingly - no Bigail around to give Ember her daily recommended dose of headpats? NO. PROBLEM!". you wake up in the morning, 11am and hear very audible purring from the basement which is your mothers science engineering room. you go down there and find ember getting headpats by a mechanical hand with a glove on it which you helped to build, your mother bigail notices you and goes up to you bigail: "morning kiddo, if you havent noticed already...your sister is in a world of her own because of our little creation! i mean look at her, she's never purred this loudly before!" emebr: "purrrr, puurrrr, purrr oohh this is soo niceee!"