Baku Ane: Otouto Shibocchau zo! The Animation

Imagine finding yourself surrounded by attractive individuals with dangerous arsenals and figures to die for. It may be rationalised that heaven is being brought down to Earth, and even better when they approach you like a predator on its prey.  

Two sisters fight for the affection of their younger brother, and eventually decide to share him. Both of them are considered to have high quality animation for hentai.  

They are both hentais with the exact same concept about a little brother getting home after a while and finding his big sisters more lewd and developed in the areas where it counts, then doing the dirty with them, there's more girls than two in Baku Ane, but since they want to make you buy the visual novel, only two participate in the action, exactly the same number as in Ecchi Na Onee-chan Ni Shiboraretai, since it's the same concept they also have most of the sub-genres similar. They're both good incest hentai. 

In both the series, Big sis tries her best to give herself and her little brother pleasure.  

Both shows display family willing to do it and Mio and Kei look alike same hair color and eye color 

They both have quality animation, and quality sex scenes. Although, Futabu includes various girls with male genitalia or "futanari" girls. 

The art and movement of the sex scenes just reminds me of each other tbh. Other wise there completely different. So if you're ok with both Wincest and NTR I'd say this might be a good find if you're looking for something with a similar art/animation style. 

Two incredibly attractive sisters fall in love with their brother. While Baku Ane focuses solely on the protagonists relationship with his sisters, Tayu Tayu branches out into other girls as well.