amitakartok: Read this doujin just now, it's pretty good. Basically, Yui once 'accidentally' made a four year old Shinji cum and decided to give him the Talk, only to somehow end up giving him a blowjob every time she tried to teach him how to jerk off. After that, she basically went 'ah, to hell with it' and ended up sexually servicing Shinji day by day.
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