Imouto Bitch ni Shiboraretai

both have really good characters with huge oppai sizes and are really good to watch if you like the other if your into it 

Both are incest hentais involving sisters, even the title is almost identical, although because of the title you may noticed that the main difference is that one is little sister (Imouto) while the other one big sister (Onee-chan), but besides that even in animation, character design and what else is similar thanks to the same producing company. 

So funny thing, the anime of Energy Kyouka!! Didn't kite adapt all the manga, so in the second episode it kinda ends as a harem with the protagonist's big brother, there's some confessions and romance there, which reminds me of Imouto Bitch Ni Shiboraretai, the part of bitch is only present in the title and the body proportions of the imoutos in there, so there's not much going on for the rest of the similar aspects of both, since Kyouka is a complete slut for the whole first episode and partially in the second, but just for that second part vanilla incest this deserves the recommendation. read more 

Both are wincest stories about a cute little sister (in Imouto Bitch No Shiboraretai features a little sister per episode), all the little sisters present here are busty, curvy, blonde and completely submissive to their brother's cock, the brothers are always the generic hentai protagonist, but that's not the point of interest, is it? Even if one has Bitch in the title, they're only bitch for their brothers alone, so there's nothing to worry about. Recommended if you like vanilla stories involving little sisters. 

Don't worry the word bitch is just used here to describe a person who loves sex, BUT only with the brother that she loves, that's right nothing more here than pure, unadulterated, vanilla wincest (plus one or two girls), good animation in both of them and great art, it's really beautiful when that happens, the little sister in both is blonde (which is a pretty common trope with little sisters). In Imouto Bitch there's two episodes for two imoutos, in Katekano there's besides the imouto, two another girls who aren't blood related, but it's still a nice addition. Enjoy.